- 1CSIR-Central Institute of Mining and Fuel Research, Dhanbad, Jharkhand, India
- 2Department of Life Sciences, School of Natural Sciences, Central University of Jharkhand, Ranchi, Jharkhand, India
Urban ecosystems play a crucial role in providing a wide range of services to their inhabitants, and their functioning is deeply intertwined with the effects of climate change. The present review explores the dynamic interplay between urban ecosystem services and climate change, highlighting the reciprocal relationships, impacts, and adaptation strategies associated with these phenomena. The urban environment, with its built infrastructure, green spaces, and diverse human activities, offers various ecosystem services that enhance the wellbeing and resilience of urban dwellers. Urban ecosystems offer regulatory services like temperature control, air quality upkeep, and stormwater management, plus provisioning like food and water. They also provide cultural benefits, promoting recreation and community unity. However, climate change poses significant challenges to urban ecosystem services. Rising temperatures, altered precipitation patterns, and increased frequency of extreme weather events can disrupt the functioning of urban ecosystems, impacting the provision of services. Heatwaves and urban heat island effects can compromise human health and energy demands, while changes in rainfall patterns can strain stormwater management systems and lead to flooding. Moreover, climate change can disrupt biodiversity and ecological processes, affecting the overall resilience and sustainability of urban ecosystems. To address these challenges, cities are adopting various adaptation strategies that recognize the interdependence between urban ecosystems and climate change. Green infrastructure interventions, such as the creation of urban parks, green roofs, and community gardens, aim to mitigate the impacts of climate change by enhancing the regulation of temperature, improving air quality, and reducing stormwater runoff. Additionally, urban planning and design approaches prioritize compact and walkable neighborhoods, promoting public transportation and reducing reliance on fossil fuels. Furthermore, engaging communities in the management of urban ecosystems and climate change adaptation measures is crucial for ensuring equitable distribution of ecosystem services and building social resilience. Therefore, the review article highlights a comprehensive understanding of the dynamic interrelationship between urban ecosystem services and climate change and their implications. By recognizing and integrating the contributions of urban ecosystems, cities can develop sustainable and resilient strategies to mitigate and adapt to climate change, ensuring the wellbeing and habitability of urban environments for present and future generations.
1. Introduction
Currently, 56% (4.4 billion) world population reside in urban areas, projected to reach nearly seven out of 10 by 2050 (World Bank, 2023). Urbanization's potential for sustainable growth lies in cities contributing over 80% of global GDP, fostering productivity and innovation when managed effectively (Zhang, 2016). In such an era marked by rapid urbanization and escalating climate change, the intricate relationship between urban ecosystems and the changing climate has come to the forefront of global environmental discourse. Cities, as vibrant hubs of human activity and economic development, rely heavily on the services provided by their surrounding ecosystems to sustain and enhance human wellbeing. These services, known as urban ecosystem services, encompass a wide range of benefits, including clean air and water, climate regulation, food production, cultural and recreational opportunities, and support for biodiversity. By adopting the ecosystem services approach, researchers, advocates, and policymakers can effectively showcase the advantages that urban trees and other elements of ecological infrastructure provide to human societies. This framework allows for a comprehensive evaluation of the positive impacts, such as improved wellbeing, enhanced environmental quality, and social values, while also considering potential drawbacks and costs (Salmond et al., 2016). By precisely identifying, measuring, and modeling these benefits, informed decisions can be made, priorities can be set, and resources can be allocated efficiently for the planning and management of urban green infrastructure.
In mainstream concept, ecosystem services have been merely divided into four categories according to the classification offered by the Millennium Ecosystem Assessment (2005) regulatory, provisioning, cultural, and supporting services. Several researchers have proposed more detailed classifications of ecosystem services specifically tailored to urban environments. In a pioneering study by Bolund and Hunhammar (1999), they introduced a straightforward categorization of ecosystem services that are distinct to urban ecosystems and environments. Their research emphasized the numerous benefits that urban green infrastructure offers to human health. These benefits include micro-climatic control, air purification, acoustic attenuation, rainwater harvesting, effluent treatment, and aesthetic values. However, the delicate balance between these urban ecosystem services is being disrupted by the far-reaching impacts of climate change. Rising temperatures, altered precipitation patterns, sea-level rise, and more frequent extreme weather events pose significant challenges to the functioning and resilience of urban ecosystems. Moreover, there have been noticeable changes over time including the rapid reduction of ozone in the stratosphere, the expansion of desert areas, the loss of forests, excessive deposition of nitrogen in the atmosphere, a reduction in freshwater resources, shifts in land use patterns, and biotic interchanges (Thuiller, 2007).
The review highlights the aspects involving two Sustainable Development Goal, i.e., 13 and 15. The interaction between Sustainable Development Goal 13 (SDG 13), which focuses on climate action, and Sustainable Development Goal 15 (SDG 15), which emphasizes life on land, is integral to addressing the complex challenges of environmental sustainability which is being emphasized in this review. Climate change, a central concern of SDG 13, directly impacts terrestrial ecosystems and biodiversity, as highlighted in SDG 15. Mitigating greenhouse gas emissions and adapting to climate change (SDG 13) can enhance the resilience of land-based ecosystems and contribute to the prevention of land degradation, deforestation, and desertification (SDG 15). Conversely, the conservation and sustainable management of forests, wetlands, and other land resources (SDG 15) play a critical role in sequestering carbon and mitigating climate change, aligning with the goals of SDG 13. This interconnectedness underscores the importance of a holistic approach that recognizes the symbiotic relationship between climate action and the preservation of terrestrial ecosystems to achieve sustainable development.
The interplay between urban ecosystem services and climate change is a complex and dynamic relationship (Figure 1). On one hand, climate change poses threats to the provision of ecosystem services, making cities more vulnerable to environmental risks and undermining their capacity to support thriving and sustainable communities (Frumkin et al., 2008). On the other hand, urban ecosystems have the potential to act as critical tools for climate change mitigation and adaptation, contributing to efforts to reduce greenhouse gas emissions, enhance urban resilience, and promote sustainability. For example, Urban areas possess a dual role in relation to greenhouse gas (GHG) emissions, serving as both a significant source and a potential reservoir of carbon (Strohbach et al., 2012; Schröder et al., 2013). In urban environments, the source-sink feedback system functions by cities releasing greenhouse gases through activities such as transportation and energy consumption (acting as a source) and simultaneously offering potential for carbon sequestration through urban green spaces and infrastructure (functioning as a sink). Furthermore, urban soils, containing 3–5 times more carbon than natural soils in various climates, have the potential to sequester significant carbon, although the effectiveness of this sequestration remains debated due to the loss of a substantial portion of new carbon inputs through soil respiration (Upadhyay et al., 2021). Consequently, it is crucial to include cities in global initiatives aimed at mitigating and adapting to climate change (Bulkeley and Betsill, 2013; Masson et al., 2014). Urban forests, consisting of trees and shrubs within urban environments, offer valuable services for climate regulation by sequestering and storing carbon (Nowak and Crane, 2002; Strohbach and Haase, 2012; Brandt et al., 2016; Upadhyay et al., 2021). Considering their capacity to capture and retain atmospheric carbon, urban forests present a valuable tool for climate change mitigation on various scales. For instance, at micro level, it can influence the microclimatic conditions of the urban buildings and structures by providing shade, lessen up the energy consumption, and subsequently lowering carbon emissions. At meso level or at the city level, urban forests have the potential to influence solar radiation reaching the ground surface, the atmospheric humidity, and other local climatic variables (Gill et al., 2007; Redon et al., 2020). On the other hand, at macro level or at a global scale, it can serve as magnificent carbon sink (Jo and McPherson, 2001; Chen, 2015). Therefore, understanding and harnessing the interconnections between urban ecosystems and climate change is crucial for creating more sustainable and resilient cities. Nevertheless, these forests are under threat from the impacts of climate change and air pollution. The decline of forests has primarily been observed in regions spanning from 27° to 56°N latitude and 103° to 145°E longitude, encompassing subtropical, temperate, and cool temperate climates. The most significant decline has been noted in Western Japan and Korea. Across Asia, this decline can largely be attributed to localized emission sources, including traffic, thermal power plants, electric power plants, other industrial activities, and commercial areas (Sonwani et al., 2022). This review delves into the intricate dynamics between urban ecosystem services and climate change, exploring the impacts of climate change on urban ecosystems and the reciprocal role of urban ecosystems in mitigating and adapting to climate change. It examines the various components of urban ecosystem services and their vulnerability to climate change, while also highlighting the potential for urban ecosystems to contribute to climate change mitigation and adaptation efforts. This review also underscores the significance of the interplay between two pivotal Sustainable Development Goals, namely SDG 13, which centers on climate action, and SDG 15, with its focus on terrestrial ecosystems and biodiversity. This interaction is pivotal in tackling the intricate issues associated with environmental sustainability, a central theme emphasized throughout the review.
Figure 1. An illustrative portrayal showcasing the dynamic interplay between urban ecosystem services and climate change which serves as a powerful tool for communicating intricate connections. Within this representation, blue arrows signify the ways in which urban ecosystem services act as a buffer, alleviating the effects of climate change. Conversely, red arrows depict how climate change acts as a stressor, imposing strains on the delicate balance of the urban ecosystem. A, temperature regulation; B, air quality control; C, stormwater management/flood water absorption; D, flood mitigation; E, biodiversity support; F, carbon sequestration; G, pollination services; H, cultural services; I, food security; J, climate resilience; a, urban heat island/global warming; b, loss of cultural services; c, air pollution; d, biodiversity loss; e, less carbon sequestration; f, flooding; g, affected pollination; h, food insecurity.
Thus, by examining the current knowledge and emerging trends in the field, this review seeks to shed light on the complex and nuanced relationship between urban ecosystems and climate change. It aims to inform policymakers, urban planners, researchers, and other stakeholders about the importance of recognizing and valuing urban ecosystem services in the context of climate change, while also emphasizing the need for integrated and sustainable approaches that can maximize the benefits of urban ecosystems and enhance the resilience of cities in a rapidly changing world.
2. Material and methodology
The selection procedure for scientific papers for a review article followed a systematic and rigorous approach to ensure the quality and relevance of the included literature. Literature published between 2000 and 2023 in relevance to the specified sub-topics focusing on urban ecosystem services, climate change impacts on urban areas, and nature-based solutions for climate change adaptation has been the defined inclusion criteria. The following standards were used to select, appraise, and eliminate articles: (1) presenting findings from an original scientific study or a review and summary of reports of such studies, (2) determining ecosystem services under supporting, provisioning, cultural and regulating services category (3) representing studies urban ecology and global climate change. A comprehensive literature search was conducted using academic databases, such as PubMed, Google Scholar, Scopus, or Web of Science. Use a combination of keywords related to the sub-topics, such as “urban ecosystem services,” “urban structures” “climate change adaptation,” “synergies and trade-offs,” “urban development,” “policy and planning,” and “challenges.” Those papers that do not meet the inclusion criteria or are not directly related to the specified sub-topics has been excluded.
3. Navigating climate change effects on ecosystem services and sustainability
Urban Ecosystem Services encompass a wide array of services directly or indirectly influencing human wellbeing and urban functionality. As climate change accelerates, urban areas confront escalating pressures on their ecosystems and the indispensable services they provide (Weiskopf et al., 2020). For instance, in coastal cities, rising sea levels pose threats to wetland ecosystems (Plane et al., 2019) that offer flood protection, carbon sequestration (Speak et al., 2020), and habitat for biodiversity (Williams and Newbold, 2020). Urban heat islands intensify due to extreme temperatures, impacting green spaces and compromising their capacity for cooling, air quality improvement, and carbon dioxide absorption (Moser et al., 2017; Moser-Reischl et al., 2018). Changes in precipitation patterns disrupt urban water systems, affecting water availability and stormwater management, jeopardizing the crucial role of urban green infrastructure in mitigating floods and enhancing water quality (Park et al., 2010; Nelson et al., 2013; Molina-Navarro et al., 2014; Wang et al., 2017). Moreover, urbanization has triggered significant ecological and societal transformations, underscoring the need to understand the diverse benefits provided by urban ecosystems and effect of climate change on ecosystem services (Bai et al., 2017; Wang et al., 2021).
3.1. Provisioning services in urban areas
Provisioning services in urban areas refer to the tangible goods obtained from urban ecosystems, such as food, water, and raw materials (Rodríguez et al., 2006; Kettunen and D'Amato, 2013). Urban provisioning ecosystem services encompass a wide range of benefits in urban areas which is being listed in Table 1. While cities may not seem like primary providers of these services, urban agriculture, green infrastructure, and water management play vital roles in meeting the demands of their inhabitants (Mell, 2009; Cilliers et al., 2013; Artmann and Sartison, 2018).
Table 1. A general overview of the ecosystem services associated with different urban ecosystem structures.
3.1.1. Food production
Climate change significantly impacts urban provisioning services, including food production, distribution, and access. Altered temperature and precipitation patterns influence urban vegetation yields, leading to heat stress and reduced productivity (Cârlan et al., 2020; Kabisch et al., 2021). This stress affects fish and aquatic plants in urban ponds, impacting aquaculture yields and water-related food production (Hill et al., 2017; Pagliaro and Knouft, 2020; Krivtsov et al., 2022). Changes in precipitation cause drought or excessive rainfall, affecting urban and peri-urban food production and water resources (Forkuor and Cofie, 2011; Sabiiti et al., 2014). Water scarcity can lower peri-urban agricultural productivity, potentially causing food shortages and higher prices (Wolf et al., 2003). Extreme weather events, like droughts, floods, and heatwaves, stress urban trees, hinder nutrient absorption, and damage roots, leading to lower yields (Czaja et al., 2020; Haase and Hellwig, 2022). Higher temperatures deplete food nutrients, reducing their nutritional value, while floods and storms cause spoilage and food waste (Wagstaff, 2016; Sehgal et al., 2018; Blekking et al., 2022). Disruptions in supply chains and transportation lead to food losses, impacting urban populations. Climate-induced changes increase food prices, affecting affordability, particularly for low-income households. Farmers may adapt to alternative crops, influencing food choices in urban areas (Blekking et al., 2022). Furthermore, the susceptibility of crops to environmental stress induced by the emission of greenhouse gases is a matter of significant concern, as highlighted by Uprety and Saxena (2021). Climate change is making its presence felt in India with noticeable shifts like shorter winters and an earlier onset of summer than usual. This change is particularly significant due to India's proximity to the equator. Additionally, the delayed sowing of wheat, caused by late rice harvesting, places the wheat crop at risk of high-temperature stress during the crucial grain-filling stage (Ghosh et al., 2020), ultimately resulting in terminal heat stress and reduced crop yields. According to simulations conducted by Dubey et al. (2020), based on field experimental trials (2011–2012 and 2012–2013) the projected outcome for the year 2050 indicates that this terminal heat stress is expected to lead to an 11.1% reduction in wheat yield. Furthermore, another Indian researcher Guntukula (2020) uses annual time-series data from 1961 to 2017 to examine how rainfall, maximum, and minimum temperatures affect crop yields of rice, wheat, pulses, sugarcane, and groundnut in India. The study revealed that a spike in rainfall could negatively affected food crops except pulses, whereas the average maximum temperature helps food and non-food crops except rice. Furthermore, food crops tend to benefit from average minimum temperature.
Climate change poses diverse and interconnected challenges to urban livestock and dairy (Beneberu and Wondifraw, 2020; Chari and Ngcamu, 2022). Rising temperatures induce heat stress (Polsky and von Keyserlingk, 2017), reducing productivity (Babinszky et al., 2011), impairing reproduction (Boni, 2019), and increasing mortality in animals (Crescio et al., 2010), affecting milk quality (de Felicio Porcionato et al., 2009). Altered precipitation patterns limit water availability, impacting hydration, sanitation, and causing waterborne diseases. Climate shifts influence feed crop growth, affecting nutrition and animal health, and alter disease and pest distribution, requiring additional resources (Bett et al., 2017; Murray-Tortarolo and Jaramillo, 2019, 2020).
3.1.2. Timber quality
Climate change also significantly impacts urban timber provision services (Sevianu et al., 2021). Changes in temperature, precipitation patterns, and extreme weather events can have profound effects on the quality and quantity of timber resources within urban ecosystems. Higher temperatures and prolonged heatwaves can stress urban trees, altering their growth, wood quality, and suitability for construction (Depietri et al., 2012; Esperon-Rodriguez et al., 2021; Marchin et al., 2022). Increased temperatures can also impact timber's chemical composition, affecting durability and resistance to decay, pests, and fungi (Ayanleye et al., 2022). Changes in precipitation patterns influence urban tree growth, with droughts reducing timber availability due to water stress (Savi et al., 2015) and excessive rainfall lowering yields by affecting root health and nutrient uptake (Sieghardt et al., 2005; Brune, 2016). Additionally, changes in the distribution of timber-yielding tree species have been documented as climate change induced alteration. A recent study by Patasaraiya et al. (2023) investigated how climate change is affecting the distribution of important timber-yielding tree species in India, particularly Sal and Teak, which were identified as crucial species by Kaul et al. (2010). The study focused on central India and used high-resolution modeling for two future time periods (2050 and 2070) under two climate change scenarios (RCP 2.6 and 8.5). The study's findings indicated that there will likely be an expansion of suitable habitat for teak in the future, while the habitat for sal is expected to decrease. Temperature was found to be the primary influencing factor for teak, whereas precipitation played a critical role in the distribution of sal. Climate change also affects pest and disease prevalence, favoring certain pests and leading to timber losses (Volney and Fleming, 2000; Holmes et al., 2009). Extreme weather events like storms and hurricanes damage urban forests, causing tree mortality and limiting timber availability (Escobedo et al., 2009; Landry et al., 2021).
3.1.3. Water quality and replenishing groundwater
Soil compaction from human activities hinders water infiltration, increasing stormwater volume and flood risks. Urban forests influence watershed hydrology by intercepting, evapotranspiring, and storing rainfall (Oke, 1989; Wang et al., 2008; Berland et al., 2017). Climate change exerts selective pressures on urban tree species, leading to shifts in their distribution and abundance. Some species exhibit enhanced resilience, while others struggle to adapt, impacting their capacity for rainfall interception and water retention (Jones et al., 2020). Climate-induced shifts in rainfall patterns challenge urban trees' ability to intercept and store intense rainfall events, leading to increased runoff and reduced water infiltration (Riedel and Weber, 2020; Hendricks and Dowtin, 2023). Drought stress associated with climate change decreases canopy cover and evapotranspiration, limiting the capacity of urban trees to intercept and store rainfall (Baptista et al., 2018; Carlyle-Moses et al., 2020). Extreme rainfall overwhelms canopy interception capacity, saturates soil, and leads to increased runoff (Qin, 2020). Soil erosion and compaction compromise tree root systems, hindering water uptake. Warmer temperatures from climate change elevate evapotranspiration rates, impacting groundwater recharge and soil moisture maintenance (Chan et al., 2019). Additionally, climate-induced pest and pathogen activity reduce canopy interception and transpiration, while altered tree-microorganism interactions compromise tree defenses (O'Neil-Dunne et al., 2014). Climate change-induced disruptions exacerbate urban tree illnesses, affecting their capacity to manage rainfall water.
3.2. Regulating services for urban resilience
Regulating services, integral to urban resilience, encompass imperceptible yet crucial functions like maintaining the quality of air and soil, providing flood and disease control, and plant pollination (Haase et al., 2014; McPhearson et al., 2014) (Table 1). Despite their inconspicuous nature, detrimental perturbations of ecosystem regulating services can lead to substantial, intricate losses that pose challenges in restoration (Baró and Gómez-Baggethun, 2017; Palliwoda and Priess, 2021; Morris et al., 2022).
3.2.1. Air quality
Reducing air pollution poses a critical issue in numerous major urban centers across various income-level nations. Scientific studies (Jalaludin et al., 2004; Karagulian et al., 2015) consistently reinforce the detrimental effects of ambient air pollution on human health. In the latest Global Burden of Diseases Study, air pollution ranked as the fourth primary contributor to premature mortality worldwide in 2019, accounting for 6.67 million untimely deaths (Murray et al., 2020). The urban air quality of many cities is jeopardized by local emissions from transportation, industries, and other origins, while climate change also significantly influences these conditions. This interaction not only modifies local microclimates and influences building energy consumption but also involves the release of pollen, impacting allergies (D'Amato, 2011), and volatile organic compounds (VOCs), which contribute to the formation of O3 and PM2.5 (Wakamatsu et al., 2017; Pandey and Ghosh, 2022).
Besides, acting as a sink to various air pollutants, urban vegetation emits biogenic volatile compounds (BVOC), contributing to ground-level ozone (O3) and carbon monoxide formation (Davoren and Shackleton, 2021) and such problem could be exacerbated under present scenario of climate change (Ghosh et al., 2018). Conversely, research suggests that trees, especially low volatile organic compound (VOCs) emitters, can effectively decrease urban O3 levels (Taha, 1996; Nowak et al., 2000; Ghosh et al., 2018; Sicard et al., 2018; Fitzky et al., 2019). Ground-level ozone concentrations can surge significantly due to the oxidation of isoprene (BVOC) by NOx, as noted by Lerdau et al. (1997). The presence of substantial NOx, stemming largely from automobile exhaust within urban locales, contributes to elevated urban O3 levels when combined with VOCs emitted by nearby vegetation. The findings of Saxena and Ghosh (2011) unveiled those locales in Delhi, characterized by dense vegetation and significant vehicular emissions exhibited the most pronounced O3 formation which was linked to the release of precursor gases (NOx and VOCs) responsible for ozone production, emanating from traffic sources, as well as VOCs discharged by vegetation like isoprene and terpenes.
In addition to the inherent VOCs emission capacity of trees, the atmospheric conditions of a given region play a pivotal role in O3 formation. This phenomenon is particularly notable in Mediterranean and tropical countries, as explored by Calfapietra et al. (2013). Consequently, a meticulous approach to urban plantation strategies is imperative to manage the burden of VOCs emissions. The selection of high VOC-emitting species for urban environments could exacerbate VOCs emissions and, by extension, O3 production—a concern, especially in light of the already elevated global O3 levels. Moreover, the situation could worsen due to global warming, as high temperatures and extended periods of sunshine tend to promote the formation of O3.
3.2.2. Climate regulation
United Nations (2018) attributes 60% of anthropogenic greenhouse gas emissions to urban activities. Urban vegetation, particularly trees, directly counteract greenhouse gas emissions by sequestering carbon dioxide through photosynthesis and biomass storage (Nowak et al., 2013a; Agbelade and Onyekwelu, 2020; Klein et al., 2021). Most of the mentioned studies focus solely on CO2 flux from urban trees and vegetation, neglecting soil contribution. Urban soils, particularly those rich in organic matter (histosols or peat soils), can serve as substantial carbon sinks (Malone et al., 2023). However, shifting climate conditions might influence the growth and survival of trees and plants. Rising temperatures can dehydrate and damaged roots, thus reducing their ability to absorb water, affecting soil microbial communities and impacting nutrient uptake by plants (Pandey et al., 2019). Climate change can pose a threat to the availability of nutrients (Lotze-Campen, 2011; Elbasiouny et al., 2022). Nonetheless, the process of global warming has the potential to alter the yearly and seasonal patterns of nutrient availability and cycling (Koller and Phoenix, 2017). Specifically, changes in the availability of carbon (C), nitrogen (N), and phosphorus (P) can have significant consequences for plant life, as these nutrients are vital for proper plant growth and development. Insufficient nutrient availability can lead to stunted growth of the urban trees, their instability, and vulnerability to other stressors. Thus, elevated temperature due to climate change, diminished the capacity of the urban green spaces to counteract local warming. Higher temperatures could potentially undermine the cooling effect provided by vegetation, reducing their ability to create cooler microclimates within urban areas.
Additionally, extreme weather events such as flooding, prolonged droughts can compromise the health of urban vegetation, reducing its carbon sequestration potential. These events can even cause soil erosion and disrupt the carbon stored in the soil. Warmer temperatures might accelerate microbial activity in the soil, potentially leading to increased decomposition of organic matter (Elbasiouny et al., 2022; Shahzad et al., 2022). This could lead to an accelerated release of carbon into the atmosphere in the form of carbon dioxide (Dotaniya et al., 2016), contributing to a positive feedback loop that amplifies the effects of climate change. Additionally, changes in soil moisture levels can affect the balance between carbon uptake and release, potentially leading to reduced carbon sequestration. However, soil respiration can also emit carbon (Velasco et al., 2016; Upadhyay and Raghubanshi, 2020), adding complexity to urban carbon budget assessments under ongoing climate change scenario.
3.2.3. Pollination and flowering
Pollination, typically classified as a regulating service (Smith et al., 2011; Crossman et al., 2013), occurs through abiotic (primarily wind) or biotic (pollinating animals) means (Ollerton et al., 2011). Flowering plants, as complex biological entities, intricately intertwine with the survival and reproductive success of a myriad of pollinators, comprising bees, butterflies, and a plethora of other insect species (Dorin et al., 2022). The symbiotic relationship between these plants and pollinators is an elemental cornerstone of ecosystem functionality (Stevenson et al., 2020). Through this dynamic interaction, they inadvertently transfer pollen grains, laden with genetic material, from one flower to another, orchestrating the fertilization process vital for plant reproduction (Carper et al., 2022). The consequences of this mutualistic alliance extend far beyond the realm of botany, as numerous plant species integral to human sustenance and wellbeing heavily depend on successful pollination events (Oliveira et al., 2019).
Amid the various facets of climate change, one aspect that stands out is the impact of heat stress. This stress not only affects pollination services, foraging behavior, and the overall growth of pollinators but also triggers observable changes in these areas (Zhao et al., 2021). These negative effects are projected to be even more pronounced as climate change progresses, with significant shifts expected in tropical, cold, and mountainous regions, as previously noted by Medina et al. (2018), Alqarni (2020), and Soroye et al. (2020). The primary driving force behind these changes is the heightened frequency and duration of heat waves, which have become a prominent characteristic of climate change (Xu et al., 2018). Of particular concern is the impact on tropical regions, which are already accustomed to elevated temperatures. With the anticipated temperature increases brought about by climate change, these tropical regions are likely to experience a disproportionately negative impact compared to temperate areas (Mora et al., 2013). The rising temperatures have far-reaching consequences on the reproductive processes of plants, potentially leading to decreased fertility in numerous species and subsequent effects on pollination. The repercussions of heat stress extend to changes in pollen quantity, morphology, cell wall structure, and notably, pollen metabolism (Hedhly, 2011; Chaturvedi et al., 2021).
Climate change has sparked significant interest due to its considerable impact on pollination. Two key effects have garnered attention: (a) disruptions in the timing of plant-pollinator interactions, known as phenological decoupling, and (b) shifts in the geographical distribution of these interactions, referred to as spatial decoupling (Høye et al., 2013; Herrera et al., 2014; Sirois-Delisle and Kerr, 2018). The influence of heat on this delicate balance is noteworthy, as it can lead to reduced pollen viability and alter the timing of flower initiation and opening, ultimately impacting successful pollination. When flowering times shift while pollinator schedules remain unchanged, mismatches between flowers and pollinators arise. This can instigate phenological decoupling in plant-pollinator interactions, with temperature changes causing distinct shifts in developmental stages among plants (Settele et al., 2016). Notably, some butterflies have exhibited 3-fold faster spring advancement in phenology compared to their host plants, highlighting an increasing asynchrony between these two groups (Settele et al., 2016). Such phenological mismatches can have cascading effects. They may lead to diminished food availability for insect pollinators while also reducing pollinator visits to the very plants they serve. This misalignment further disrupts pollen transfer, resulting in decreased fertilization rates and reproductive success. These repercussions, in turn, reverberate through plant fitness and offspring viability. The cumulative impact of heat-induced disruptions during flowering and fruiting can impede genetic diversity and jeopardize population persistence. Additionally, evidence points to the ongoing shift in the spatial distribution of insect pollinators because of climate change. This phenomenon is projected to persist, particularly affecting bumblebees and butterflies (Settele et al., 2008; Rasmont et al., 2015). Heat stress further amplifies these challenges by diminishing the production of secondary metabolites like phenolic compounds, which act as natural defenses against pests and pathogens. While heat-induced stomatal closure limits water loss, it also reduces the emission of volatile organic compounds (VOCs) that contribute to pest deterrence. The alteration in VOC composition under heat stress modifies the pattern of attraction or repulsion of pests, adding another layer of complexity to the evolving dynamics of plant-insect interactions.
3.3. Supporting services for urban ecosystem functioning
Supporting services provided by urban ecosystem services are the invisible but essential foundation that sustains the functionality and health of cities (Table 1). These services encompass processes like nutrient cycling, soil formation, and biodiversity maintenance, working behind the scenes to ensure the vitality of urban environments. They contribute to the productivity of urban green spaces, facilitate water purification, and foster habitat for diverse species. As urban areas grapple with the challenges posed by rapid development and climate change, recognizing and nurturing these supporting services becomes paramount. Climate change has exerted noticeable impacts on urban supporting ecosystem services, altering the foundational processes that sustain urban environments. Rising temperatures and altered precipitation patterns influence soil health and composition, affecting nutrient cycling and soil fertility (Scholes, 2016; Weiskopf et al., 2020; Bakure et al., 2022). Rising temperatures lead to heightened soil organic matter decomposition, potentially elevating soil carbon losses and causing shifts in C:N balances (Davidson and Janssens, 2006). These alterations are influenced by various biotic interactions, including secondary changes to the composition of soil microbial communities (Crowther et al., 2011). Concurrently, human activities linked to climate change, such as the combustion of fossil fuels, lead to heightened nitrogen deposition. This deposition carries significant consequences for both terrestrial and aquatic ecosystems, notably contributing to issues like eutrophication (Galloway et al., 2008). The urban environment, in particular, contends with heightened vulnerabilities to more intense and erratic rainfall, leading to elevated risks of flooding and erosion that directly impact water regulation and purification services. The essential role of biodiversity in enhancing ecosystem resilience faces jeopardy, with many species struggling to acclimate to the evolving environmental conditions. Notably, recent research by Habibullah et al. (2022) underscores that the impact of biodiversity loss is notably influenced by shifts in precipitation and temperature, surpassing even the effects of alterations in the frequency of natural disaster events. Urban heat islands, exacerbated by climate change, strain energy systems and human health while also disrupting natural processes. The interplay of these factors has led to a decline in the capacity of urban ecosystems to provide essential supporting services, challenging the ability of cities to maintain their functionality and the wellbeing of their inhabitants. Adaptation and mitigation strategies are crucial to restore and enhance these services, ensuring the resilience and sustainability of urban areas in the face of a changing climate.
3.4. Cultural services and human wellbeing
Cultural ecosystem services can be defined as the non-material benefits that people obtain from nature, including spiritual, aesthetical, educational and recreational values (Schaich et al., 2010; Plieninger et al., 2015; Ament et al., 2017). Parks, green spaces, and vibrant urban landscapes offer places of relaxation, leisure, and social interaction, enhancing the overall quality of life in cities (Gotham and Brumley, 2002; Kazmierczak, 2013; Tsunetsugu et al., 2013; Cox et al., 2017; Verma et al., 2020). These spaces serve as venues for cultural events, festivals, and artistic expressions, fostering community identity and connection (Ulrich, 1981; Kaplan, 1985; Van den Berg et al., 2010; Russell et al., 2013). Additionally, urban ecosystems offer settings for education and learning, enabling people, especially children, to connect with nature and gain insights into ecological processes (Tidball and Krasny, 2011).
Climate change is affecting some of the critical services that ecosystems provide to society (Lipton et al., 2018). The cultural ecosystem in terms of recreation and tourism provides valuable services which play a crucial role in generating substantial economic benefits (Reyers et al., 2013). Most recreational services exhibit a high degree of vulnerability to the impacts of global warming, with a particular emphasis on outdoor winter sports and tropical holidays (Khan et al., 2013). Many urban cultural events and festivals take place in outdoor settings, drawing residents and tourists together to celebrate diversity and community spirit. However, climate change can disrupt these events by increasing the risk of extreme weather events such as storms, heavy rainfall, or heatwaves. These weather patterns could lead to cancellations, rescheduling, or diminished attendance, impacting the vibrancy and social cohesion associated with such gatherings. In a recent investigation conducted by Dhavale et al. (2022), findings reveal a notable 52% surge in cyclone occurrences within the Arabian Sea from 2001 to 2019. Moreover, the study reports a staggering 150% increase in the incidence of “very severe” cyclones during the same period. These climatic shifts have consequently impacted coastal tourism in states like Goa and Kerala.
The global phenomenon of climate change has been observed to have a significant impact on these cultural ecosystem services on a worldwide scale (Tuvendal and Elmqvist, 2011). Climate change can alter the availability and functionality of the green spaces. Increased temperatures, heatwaves, and shifting precipitation patterns, rising air pollution might limit the comfortable use of outdoor areas, reducing people's ability to engage in outdoor activities like picnicking, jogging, or sports (Evans, 2019). Moreover, droughts and water scarcity can negatively impact the vitality of green spaces, affecting the visual appeal and recreational value of these areas. These effects are not limited to specific regions, but rather have implications that extend beyond geographical boundaries. Debnath et al. (2023) conducted a recent study highlighting the vulnerability of the entire Delhi region, India, to severe heat wave impacts. Surprisingly, the current state action plan for climate change does not acknowledge this vulnerability. Through an analytical assessment of the Heat Index (HI) combined with the Climate Vulnerability Index (CVI), the study reveals that over 90% of the country faces an alarmingly high risk level, with potential adverse effects on livelihood adaptability, food grain yields, the spread of vector-borne diseases, and urban sustainability. These conditions not only have the potential to deter tourists but also pose health risks, including heat-related illnesses. Furthermore, urban ecosystems often historical sites, monuments, and culturally significant landmarks that connect residents to their heritage and identity could be affected by climate change-related factors which can damage or threaten these sites, potentially erasing important aspects of a city's cultural history and identity (Quesada-Ganuza et al., 2021).
4. Enhancing urban ecosystem services for climate change adaptation
4.1. Green infrastructure and ecological design
Green infrastructure and ecological design play crucial roles in climate change adaptation by promoting sustainable and resilient solutions. They encompass a range of practices and systems that harness the power of nature to mitigate the impacts of climate change and enhance ecosystem services. Green infrastructure refers to strategically planned and managed networks of natural and semi-natural areas, as well as green spaces within urban environments (Bendict and McMahon, 2006; Wright, 2011; Matthews et al., 2015). It includes features such as urban forests, wetlands, green roofs, green buildings, green walls, permeable pavements, and bioswales, vegetated surfaces green streets and alleys, community parks and gardens (Gill et al., 2007; Douglas, 2010; Klemm et al., 2015). These elements work together to provide multiple benefits, including stormwater management, heat island reduction, lowering of wind speed, reduction in energy consumption, air quality improvement, biodiversity conservation, carbon sequestration and maintenance of wellbeing of the urban societies, nevertheless, the full measure of these advantages is still up for debate (Pataki et al., 2011). Table 2 presents a compilation of noteworthy case studies covering these diverse ecosystem structures spanning the years 2013 to 2023.
In the context of climate change adaptation, green infrastructure helps cities and communities cope with the challenges posed by changing climate patterns. By capturing and storing rainfall, green infrastructure reduces the risk of flooding and enhances water resource management. It also helps mitigate urban heat islands by providing shade, evaporative cooling, and natural ventilation, thereby reducing energy consumption for cooling purposes. For example, the city of Portland, located in the northwestern United States, serves as an illustrative case of how adopting a green infrastructure design approach for managing flood risks can yield a wide range of benefits for the local community, both at the site and neighborhood level. In response to significant strain on Portland's drainage system, leading to around 50 combined wastewater overflows into the Willamette River in 1990, Hoyer et al. (2011) emphasize the proactivmeasures taken by the city's municipal government. They implemented a diverse range of green infrastructure initiatives to alleviate the burden on the sewer system and minimize adverse impacts on urban waterways. These measures include providing monetary incentives for disconnecting downpipes, redirecting stormwater to lawns, gardens, and ground infiltration, constructing green roofs to boost local biodiversity, and establishing a network of green spaces for recreational purposes, which also helps mitigate rainwater runoff into the Willamette. By implementing such programs, there is an increase in local biodiversity, as well as an enhancement in the attractiveness of the streetscape (Hoyer et al., 2011). In a similar vein, Lancaster (2006) analyze the comprehensive and community-based drainage programs in Vancouver, Canada. The municipal government has actively encouraged the Green Streets program, which enables residents to engage in city gardening through the funding of projects aimed at improving roadside areas (Lancaster, 2006).
Ecological design focuses on integrating ecological principles and processes into the planning and design of human-built environments. It seeks to create sustainable and regenerative systems that harmonize with nature. Ecological design approaches consider the ecological, social, and economic aspects of a project to foster resilience and adaptability. In the face of climate change, ecological design emphasizes strategies such as using native plant species, restoring and enhancing natural habitats, promoting biodiversity, and conserving natural resources. As an illustration, the plans for Ho Chi Minh City in Vietnam encompass various strategies such as reservoir management, constructing a ring dike, and preserving the riparian area, all with the primary objective of flood prevention. One potential advantage of safeguarding the riparian zone is the preservation of habitat integrity and species diversity, as demonstrated in Lagos, Nigeria. Furthermore, the Ho Chi Minh City plan includes a target to reduce river pollution, which presents additional opportunities for biodiversity benefits (Butt et al., 2018). Chennai and Kochi are showing initial progress in embarking on a journey toward urban climate transition. These Indian cities actively participated in normative adaptation integration, leveraging a diverse array of actions and projects. They prioritized the restoration and enhancement of Blue-green infrastructures as a foundational strategy to bolster urban resilience in the face of climate change challenges. Notably, international cooperation organizations played a pivotal role in assisting the municipalities in these case studies, particularly in the revitalization of the Buckingham Canal in Chennai and the Mullassery Canal in Kochi, marking a significant milestone in the evolution of a novel regulatory framework (Sánchez and Govindarajulu, 2023). By integrating green infrastructures into urban development, there is also the potential to enhance landscape connectivity, provide supplementary or improved habitat, and in certain cases, facilitate the establishment of controlled populations of threatened species (Butt et al., 2018). These strategies not only enhance ecosystem resilience but also provide numerous co-benefits, such as improved air and water quality, enhanced wildlife habitats, and enhanced community wellbeing. Therefore, such integration of nature-based solutions into urban planning and design, cities can better prepare for the future while promoting ecological health and human wellbeing.
The global consciousness surrounding sustainability in the construction sector has been steadily increasing, driven by factors such as climate change, population growth, and rapid urbanization. This growing awareness has led to a heightened demand for green buildings as a means to achieve sustainable development (Gou and Xie, 2017). Green buildings, as defined by The Energy and Resource Institute, a non-profit organization specializing in sustainable development, are structures meticulously designed, constructed, and operated to minimize their overall environmental impact while simultaneously enhancing user comfort and productivity (GRIHA Manual, 2010). Evidence supporting the economic advantages and reduced energy consumption associated with green buildings has emerged from various studies. For instance, research conducted in Malaysia demonstrated that green buildings can save ~71.1% of energy compared to industry baseline standards, underscoring their economic benefits and energy efficiency (Dwaikat and Ali, 2018). The imperative to reduce carbon emissions from buildings and construction aligns with the broader goal of mitigating the global impact of climate change. Moreover, the environmental, social, and economic benefits of green infrastructure, such as green roofs and walls, extend beyond the building itself. A simulation study conducted by Pragati et al. (2023) on multi-storied commercial buildings in Chennai, situated in India's hot and humid tropical climate, revealed significant positive impacts of greening systems on the urban environment. These systems led to reductions in air temperature, radiant temperature, humidity, and solar gain. Furthermore, they lowered the total energy consumption of buildings with green roofs and walls by 10.5% and reduced district cooling demand by 13%. In addition to these energy-related benefits, greening systems also substantially improved air quality and overall building energy efficiency.
4.2. Urban agriculture and food security
There is a growing global focus on recognizing the significance of cities in fostering resilient and ecologically sound food systems. These systems play a crucial role in withstanding and recovering from various crises, including natural disasters like storms, droughts floods, as well as anthropogenic and socioeconomic emergencies. The emergence of the COVID-19 pandemic has shed light on the importance of food resilience within cities, prompting a fresh consideration of the desired level of food self-sufficiency achievable through urban agriculture. This socio-economic crisis has prompted us to reevaluate the role of urban agriculture in ensuring a reliable and resilient food supply within cities. As a result, international policy efforts are increasingly directed toward understanding and addressing the pivotal role, cities play in ensuring food security and adaptability in the face of challenges.
The Sustainable Development Goal 11 of the UN 2030 Agenda for Sustainable Development acknowledges the imperative of creating inclusive, secure, resilient, and eco-friendly cities and human settlements. Within this agenda, there are additional goals related to sustainable agriculture that aim to alleviate poverty (SDG 1), enhance nutrition and diminish hunger (SDG 2), promote sustainable supply and demand patterns (SDG 12), and mitigate the effects of climate change (SDG 13). While agriculture has traditionally been practiced in and around cities, it is only recently that urban agriculture has gained formal recognition in international agendas. What distinguishes urban and peri-urban agriculture is not merely its urban location, but rather its integral role within the urban socioecological and economical system (Mougeot, 2000). The dependency of urban and peri-urban agriculture on urban resources such as land, workforce, and organic waste from the treated wastewater and municipal solid wastes to be used in the form of organic fertilizer, cannot be ignored. The urban agricultural system is also profoundly influenced by urban conditions such as governmental policies, regulations, land competition, urban markets demand patterns, and prices. Moreover, it in turn could impacts the urban system by affecting food security, poverty, ecology, and public health. Thus, urban agriculture plays a vital role in climate change adaptation by contributing to food security and enhancing the resilience of urban communities.
Over the past decade, urban agriculture has experienced a significant shift in perception, moving from being considered a niche interest to garnering substantial attention from policymakers and urban planners, both in developed and developing nations. The urgency of providing sustenance to a rapidly urbanizing global population has become a critical priority for cities (FAO, 2012, 2014). The incorporation of productive landscapes into urban design and development planning has gained widespread acceptance (Bohn and Viljoen, 2011), recognizing the need for integrating agricultural practices within urban environments. In the context of climate change, urban agriculture offers several benefits for adaptation strategies when integrated with proper policy framework, resulting to smart climate agriculture (Figure 2). The expansion of urban and peri-urban agriculture offers a valuable solution in mitigating the consequences of increased rainfall by preserving low-lying areas free from construction. This approach helps to minimize the impact of floods, reduce runoff, and facilitate the storage and infiltration of excess water. Notable examples include the cities of Kesbewa in the Western Province of Sri Lanka and Rosario in Argentina, which actively promote the preservation and safeguarding of green and productive spaces along stream banks as a means to mitigate flood risks (Dubbeling, 2015). Within the framework of its Urban Master Plan (2005–2020), Beijing, China, has set forth a range of initiatives to preserve agricultural land and green spaces. These include the establishment of permanent green areas in peripheral zones and corridors, the promotion of wastewater recycling and rainwater/floodwater harvesting, the protection of forested areas and parks, and the certification and subsidization of energy-saving production practices.
Figure 2. Cultivating sustainability: How urban agriculture nurtures communities and the environment. The picture depicts how urban agriculture along with policies could enhance food security by providing local and fresh produce, reducing reliance on distant and vulnerable food supply chains. This localized food production reduces the risks associated with disruptions in transportation and distribution caused by extreme weather events or other climate-related factors. Secondly, urban agriculture can contribute to climate change mitigation by reducing greenhouse gas emissions (Sonwani and Saxena, 2022). By producing food closer to consumers, it reduces the carbon footprint associated with long-distance transportation and refrigeration. Moreover, urban farming practices such as composting organic waste and promoting soil health can sequester carbon and mitigate urban heat island effects. Thirdly, urban agriculture enhances the resilience of urban communities by fostering social cohesion and building community networks. It provides opportunities for community engagement, skill-building, and knowledge sharing, creating a sense of ownership and empowerment among residents. In times of climate-related crises, such as extreme heatwaves or flooding, urban agriculture initiatives can serve as resilience hubs, providing access to fresh food, social support, and disaster response mechanisms.
In densely populated urban areas where space is limited, cities can encourage the development of rooftop gardens to enhance the thermal comfort of apartments situated beneath them. Such agricultural rooftops not only provide food for households but also have the potential to generate income through sales. An illustrative scenario developed for Vancouver, Canada, indicates that utilizing half of the city's available rooftop space for urban agriculture could meet ~4% of the food requirements for 10,000 people. By incorporating hydroponic greenhouses into the equation, this percentage could be further increased to 60%. Prominent examples of rooftop projects in North America include Brooklyn Grange, renowned for its soil-based rooftop gardens in New York City where they cultivate over 45,000 kg of organic produce annually.1 Another notable venture is Gotham Greens, which operates hydroponic greenhouses across five states in the United States.2 These innovative initiatives showcase the potential of utilizing rooftops for urban agriculture, demonstrating successful models of sustainable food production in urban environments. Urban agriculture has indeed gained momentum in India, with various factors influencing its prospects within the Indian context. Despite its potential, urban agriculture faces notable challenges in the country. A study conducted in Bengaluru by Camille (2018) sheds light on the class-specific nature of involvement in organic terrace gardening, primarily limited to the middle class. These terrace gardens are primarily driven by concerns about declining food quality and safety. Additionally, they serve as a means to create green spaces that counteract environmental degradation in the city. However, the study points out both the possibilities and limitations of urban gardening as a middle-class intervention into unsafe food systems and deteriorating urban ecologies.
Notably, in recent times, several Indian celebrities have taken proactive steps to promote and support urban organic farming. This movement has gained popularity due to its emphasis on sustainable and chemical-free agricultural practices. These celebrities leverage their influence and resources to raise awareness about organic farming and encourage its adoption. For instance, former Indian cricket captain Mahendra Singh Dhoni operates an agricultural farm spanning 43 acres in Ranchi, Jharkhand. His farm cultivates a variety of crops, including strawberries, capsicums, dragon fruit, watermelons, muskmelons, peas, and other vegetables. Such influential initiatives have the potential to significantly raise awareness among local communities, highlighting the importance of urban agriculture and its positive impact on sustainable food production and urban environments.
4.3. Biodiversity conservation and habitat restoration
As cities continue to expand and face the challenges posed by climate change, it becomes increasingly important to prioritize the preservation and restoration of biodiversity and habitats within urban areas. Urban areas often suffer from habitat loss and fragmentation due to urbanization, leading to a decline in biodiversity. However, preserving and restoring biodiversity within cities can provide numerous benefits for climate change adaptation and the overall wellbeing of urban populations. One of the primary benefits of biodiversity conservation in urban areas is the enhancement of ecosystem services such as clean air and water, pollination, and climate regulation. For example, urban green spaces, which are part of the green infrastructure, are facing growing expectations to serve multiple ecosystem services, including provisioning (gardening), regulating (such as thermoregulation, air quality control, flood mitigation, pollination), and cultural purposes (such as aesthetic and education) (Oberndorfer, 2007; Jerome et al., 2019; Keeler et al., 2019).
According to the survey conducted by Williams et al. (2014), the most frequently mentioned conservation benefit in green roof project descriptions was the creation of biodiversity habitat through facilitating plant growth. Various taxa were reported to benefit from these habitats, including native plants, birds, reptiles, mammals, bees, butterflies, moths, spiders, beetles, grasshoppers, and flies. Numerous studies have confirmed the presence of insects on green roofs (Kadas, 2006; Colla et al., 2009; MacIvor and Lundholm, 2011; Schindler et al., 2011; Tonietto et al., 2011), which are also readily colonized by spiders and soil-dwelling arthropods (Buttschardt, 2005; Schrader and Böning, 2006). Sedum-based roofs, in particular, have been noted for supporting high densities of collembolan species, as the fleshy vegetation retains water in the substrate for longer periods, creating a suitable habitat even during the warmest and driest times of the year (Schrader and Böning, 2006). Urban gardens also emerge as vital elements in pollinator habitat networks (Hall et al., 2017), benefiting species like bumblebees (Andersson et al., 2007; Jansson and Polasky, 2010; Conflitti et al., 2022). Surprisingly, urban areas harbor diverse pollinator species, with single gardens supporting 35% of UK hoverflies (Owen, 2010) and Berlin sustaining half of Germany's bee species (Saure, 1996). Urbanization influences pollinator communities, introducing new species and favoring adaptable ones (McIntyre et al., 2001; Angold et al., 2006; Geslin et al., 2013). Urban spaces provide consistent pollinator communities, benefiting agricultural productivity both within cities and neighboring rural areas (Baldock et al., 2015). Functional response diversity varies among pollinator types in response to biosphere changes, underscoring urban gardens' significance (Jansson and Polasky, 2010). The efficacy of this intricate process is inherently linked to the diversity and abundance of flowering plants available to pollinators. The ramifications of a thriving pollinator population are not confined to the immediate floral realm but reverberate throughout the entire urban ecosystem.
Bird visitation has also been observed in many studies (Millett, 2004; Baumann and Kasten, 2010; Fernández Cañero and González Redondo, 2010), and Pearce and Walters (2012) discovered increased bat activity over green roofs. A study conducted in Dehradun, India emphasized the significant impact of tree species diversity on enhancing bird communities within urban green spaces (Kaushik et al., 2022). The study identified the size of the urban green space at the broader landscape level and the diversity of tree species at the local scale as key factors that influenced bird species richness, density, and the presence of vulnerable insectivorous bird groups across different seasons. Another study conducted in Pune, India, highlighted that vegetation composition remains the primary determinant for birds in their habitat selection, regardless of the size or location of urban green spaces (Choudaj and Wankhade, 2023). Furthermore, biodiverse habitats in urban areas play a vital role in supporting pollinators like bees and butterflies, which are essential for the reproduction of numerous plant species (MacIvor and Lundholm, 2011; O'Brien et al., 2012; Ksiazek et al., 2014; Zhang et al., 2022). Similar to managed residential gardens, green roofs can provide floral and nesting opportunities for bees in urban settings, contributing to both ecological and socio-economic benefits (Loder, 2014; Makinson et al., 2017; Baldock, 2020). However, a recent study by Dusza et al. (2020) emphasizes the importance of plant community composition in modulating plant-pollinator interactions on the green roofs. It suggests that combining plant species with diverse flowering morphologies and phenologies can enhance pollinator diversity. Therefore, urban gardens and green spaces that offer suitable habitats for pollinators not only contribute to the preservation of plant diversity but also enhance the production of fruits and vegetables. This, in turn, can enhance food security, particularly in densely populated urban areas.
Biodiversity conservation and habitat restoration also contribute to the resilience of urban ecosystems in the face of climate change impacts. To enhance urban ecosystem services for climate change adaptation, several strategies can be employed. The analysis of city adaptation plans revealed that “Physical infrastructure” and “Green infrastructure” were the predominant types of actions identified (Butt et al., 2018). The plans frequently included measures to enhance urban spaces by increasing vegetation cover through initiatives such as tree planting, expanding canopy cover, and restoring native vegetation in parks, wetlands, forests, and other natural areas within cities. This can be achieved through land-use planning and zoning regulations that prioritize the preservation of green infrastructure. Amsterdam, as a notable example, has developed a dedicated biodiversity climate adaptation plan that aims to enhance resilience against extreme events by increasing and expanding protected areas. This plan also focuses on improving connectivity to facilitate species dispersal and migration. By utilizing natural processes such as recruitment and succession, the plan aims to enhance landscape heterogeneity, thereby promoting habitat integrity and persistence, which in turn benefits threatened species (McKinney, 2002). This case study exemplifies the alignment and mutual reinforcement of climate adaptation and biodiversity protection.
Another noteworthy initiative is seen in the Brazilian NDC (Nationally Determined Contribution), which includes a target to restore and reforest 12 million hectares of forests by 2030 (Bustamante et al., 2019). The restoration of native vegetation is considered a fundamental pillar for sustainable rural development in Brazil, and it should encompass multiple objectives, ranging from the conservation of biodiversity and ecosystem services to fostering social and economic advancement. By integrating these various purposes, the restoration efforts can effectively contribute to the holistic development of the region. Another notable achievement in the restoration and conservation of urban biodiversity can be found in WIPRO's efforts in Bangalore, India.
The implementation of watershed protection activities can also play a crucial role in promoting biodiversity by effectively reducing polluted runoff and enhancing water flow within these areas. This has the potential to yield significant improvements for a total river length of 5,872 km, benefiting numerous threatened freshwater fish species identified within the cities (Butt et al., 2018). Considering the inherent dryness and higher temperatures of urban areas compared to the surrounding landscapes (Moriwaki et al., 2013), coupled with the high-water demand in cities (where 60% of urban water use is concentrated; Grimm et al., 2008), water management emerges as a key focus in many city adaptation plans. Prominent examples include cities such as Copenhagen, Rotterdam, and Lagos, which have prioritized water management strategies to address the challenges posed by climate change and urbanization.
4.4. Urban forests: carbon sequestration, air quality improvement and climate regulation
Urban forests play a crucial role in climate change adaptation, providing numerous environmental, social, and economic benefits to cities and their inhabitants. By strategically managing and expanding urban forest cover, cities can effectively address climate-related challenges and build more resilient communities. Investments in urban forests have witnessed an upsurge in numerous cities across the United States. Studies highlight the importance of expanding urban forests as they offer a desirable solution to mitigate pollution-related issues (Manning, 2008; McPherson et al., 2013). Consequently, urban tree planting initiatives are actively advocated as a planning tool to facilitate climate change adaptation, promote urban sustainability, and enhance human health and wellbeing.
Urban areas are often characterized by the “urban heat island” effect, where temperatures are significantly higher than surrounding rural areas. Urban forests can mitigate this effect by providing shade and evaporative cooling, thereby reducing ambient temperatures. The dense foliage of trees and vegetation can act as natural air conditioners, creating a cooler microclimate and reducing energy demand for cooling. Trees excel in these mechanisms compared to other vegetation types like shrubs or grass due to their higher evapotranspiration capacity. Shashua-Bar and Hoffman (2000) highlights the significance of the road-side trees in the urban ecosystem, as they could modify indoor temperatures by providing shade to buildings. This shading effect greatly induces indoor insulation (Mavrogianni et al., 2014). Furthermore, urban trees mitigate greenhouse gas emissions tied to building energy usage by regulating microclimates via shading and evapotranspiration effects (McPherson et al., 2013; Hsieh et al., 2018). This is particularly beneficial for human health in situations where financial resources are limited for cooling buildings, as it can alleviate the need for artificial cooling methods and potentially reduce energy consumption. A study by Berry et al. (2013) demonstrated that tree shade can lower wall temperatures by as much as 9°C and air temperatures by up to 1°C.
Moreover, trees contribute to increased humidity levels in their vicinity, serving as conduits for water loss to the atmosphere (Salmond et al., 2016). Their roots draw moisture from deeper soil layers, which is especially advantageous in urban areas facing water availability challenges. Implementing water-sensitive urban design, stormwater harvesting, and recycled water systems can effectively enhance soil moisture levels in cities. Water stored on urban tree canopies may either evaporate or be transmitted to the ground for root absorption (Seitz and Escobedo, 2008; Berland et al., 2017). Trees utilize some absorbed rainfall and transpire the rest. Unabsorbed canopy water drips to the ground, while stemflow mitigates raindrop impact, preventing soil erosion (Livesley et al., 2016; Qin, 2020). Leaf litter aids water absorption, stabilizes soil, and curbs erosion.
Urban forests also contribute to the sequestration of carbon. For instance, studies estimate that the urban forest in the Chicago region alone provides ~$14 million per year in carbon sequestration benefits (Nowak et al., 2013c). A recent interpretive analysis conducted by Bherwani et al. (2022) focused on five cities in India—Nagpur, Navi Mumbai, Bengaluru, Delhi, and Leh. The study utilized the normalized difference vegetation index (NDVI) and allometric relationships to evaluate the fiscal importance of urban greeneries in terms of carbon sequestration and their role in mitigating severe climatic impacts. The valuation of carbon sequestration in these cities ranged from $19.04 to $6,537.15 million, highlighting the substantial economic value associated with the carbon sequestration potential of urban green spaces. Many studies evaluating urban vegetation's carbon storage and sequestration utilize tree biomass and growth equations, often integrating field surveys and remote sensing data (Nowak et al., 2008; Liu and Li, 2012; He et al., 2017; Li et al., 2020). Some meta-analyses in the USA and China underscore significant carbon sequestration potential in urban green infrastructure (Nowak et al., 2013a; Chen, 2015). Assessments estimating urban carbon budgets generally demonstrate modest impact on offsetting through urban vegetation (Escobedo et al., 2010; Liu and Li, 2012; Vaccari et al., 2013; Baró et al., 2015; Zhao and Sander, 2015; Baró and Gómez-Baggethun, 2017). However, these studies predominantly consider direct carbon sequestration, overlooking urban vegetation's indirect contributions to reducing city energy use (Escobedo et al., 2010; McPherson et al., 2013).
Urban vegetation, particularly trees, plays a pivotal role in removing pollutants from the air through processes like pollutant uptake via leaf stomata and airborne particle interception (Linden et al., 2023). This vegetation also acts as a physical barrier, restricting pollutant entry into specific zones (Prigioniero et al., 2023). Greenery-based strategies are proposed for reducing air pollution (Nowak et al., 2006). However, the extent of vegetation's impact on urban air quality and health is debated due to predictive uncertainties and limited empirical data (Pataki et al., 2011). Through various mechanisms, such as leaf surfaces and stomata, trees absorb harmful substances, preventing them from lingering in the air and reducing their negative impacts on human health and the environment. The ability of urban trees to act as natural air purifiers highlights their immense value in combating urban air pollution and underscores the importance of preserving and expanding urban forest areas (Garcia, 2017; Kim, 2017). Dry deposition is the primary mechanism by which urban trees filter out harmful gases from the air (Cabaraban et al., 2013). With help of the stomata in their leaves, they can absorb gaseous pollutants, while capturing or trapping particulate matter in the air by other processes such as sedimentation or impaction (Gómez-Baggethun et al., 2013; Sharma and Saxena, 2022). The foliar surface serves as a resting place for particles while other surfaces, including as bark, hair, moisture, and stickiness, help to adsorb the particles on such organs (Grote et al., 2016). Studies assessing urban vegetation's air pollution mitigation capacity often employ dry deposition models. These models (Yang et al., 2005; Nowak et al., 2006, 2013b; Escobedo and Nowak, 2009; Cabaraban et al., 2013; Selmi et al., 2016; Yin et al., 2022) operate at the city scale, incorporating parameters such as leaf area index, pollution concentrations, and meteorological data. This modeling showcases substantial pollution removal by urban vegetation, though it has limited efficacy in addressing city-wide pollution challenges (Baró et al., 2015).
Air pollutants (such as O3, SO2, and NO2) that can be efficiently metabolized inside the leaf tissues are taken up through the stomata (Rai et al., 2011; Ghosh et al., 2021). The cuticle is a porous barrier that allows some pollutants (such as NO and NO2) access to the intercellular space of the plants (Bytnerowicz, 1996) where moisture or the chemicals inside the apoplast alter the gaseous pollutants and dispersed into the intercellular spaces (Omasa et al., 2002; Nowak et al., 2006). Once pollutants enter cells, they are met with defensive mechanisms and initial and subsequent metabolic reactions (Bytnerowicz, 1996). Different metabolic mechanisms in tree leaves biochemically convert each pollutant (Omasa et al., 2002). Remarkably, localized greening strategies like green roofs and walls, proposed by Pugh et al. (2012), exhibit notable reductions in NO2 (up to 43%) and PM10 (up to 62%) due to enhanced deposition without impeding ventilation. Experimental studies consistently affirm that green spaces are linked to reduced site-scale pollution, especially particulate matter (Irga et al., 2015; Yao et al., 2023). Plants can ozonolyze O3 in the sub-stomatal cavity and apoplast after it has been taken up through the stomata (Ghosh et al., 2018). Most of the carbon dioxide (CO2) that trees take in is converted into serine and then, via the serine pathway, into sucrose. Bidwell and Fraser (1972) and Nowak (1994) both suggest that photosynthesis might fix some CO as CO2.
A broad variety of plant and animal species rely on the habitats and resources provided by urban forests in cities (Stagoll et al., 2012; Wood and Esaian, 2020). Native trees are excellent in sustaining native animal populations and communities. Recent research, however, suggests that non-native trees can nevertheless help to preserve native biodiversity in urban areas (Liu and Slik, 2022). To help wildlife cope with the effects of climate change on ecosystems and migration patterns, urban woods provide safe havens. Urban areas can help the cause of biodiversity conservation on a regional and global scale by protecting and extending their green spaces.
Apart from their ecological significance, urban forests offer numerous societal benefits and wellbeings to city dwellers. Having easy access to green areas and natural habitats has been associated with better psychological wellbeing, lower anxiety levels, and more time spent being physically active. Community resilience and cohesion can be boosted by efforts to improve urban woods, which in turn increase options for leisure pursuits, civic engagement, and individual wellbeing. In this way, urban forests not only connect people with nature but also cultivate a sense of place—an intricate process where individuals interact with urban forests, have unique experiences (both favorable and unfovorable), and develop their own ways of valuing and appreciating nature (Phillips and Atchison, 2020; Bolleter and Hooper, 2021).
5. Synergies and trade-offs: balancing urban development and ecosystem services
Achieving a balance between urban development and the provision of ecosystem services is a complex challenge faced by policymakers, urban planners, and communities. A pictorial diagram has been provided illustrating the interplay between urban ecosystem services and climate change factors, depicting the environmental health of urban areas (Figure 3). While urban development is necessary for meeting the needs of the growing populations, it often leads to the loss or degradation of natural ecosystems, resulting in a reduction of essential ecosystem services. Synergies and trade-offs exist between urban development and ecosystem services, requiring careful consideration to strike a sustainable balance. Synergies refer to situations where urban development and the maintenance or enhancement of ecosystem services can reinforce one another. For example, incorporating green infrastructure, such as parks, urban forests, and wetlands, into urban designs can provide multiple benefits. These green spaces not only contribute to the aesthetic appeal of cities but also enhance air quality, regulate temperatures, support biodiversity, and offer recreational opportunities. Thus, urban development that integrates and enhances ecosystem services can create positive synergies, improving both the livability and sustainability of cities (Salmond et al., 2016). However, trade-offs can also arise when urban development compromises ecosystem services. For instance, converting natural habitats into built environments can result in the loss of biodiversity, reduced water infiltration, increased runoff, and diminished climate regulation. This can have negative consequences such as increased flood risk, reduced water quality, and decreased resilience to climate change. Trade-offs may also arise when land is allocated to urban infrastructure rather than preserving or restoring natural areas.
Figure 3. A visual diagram depicts how urban ecosystem services and climate change factors interact, offering insight into the overall environmental heath of urban regions.
5.1. Urbanization and service provision
Urbanization and land use change have profound implications for the provision of ecosystem services and pose challenges in achieving a balance between urban development and the preservation of these services. As cities expand and develop, natural ecosystems are often converted into built environments, leading to the loss or degradation of valuable ecosystem services. Balancing urban development and ecosystem services requires understanding the synergies and trade-offs associated with these processes. Urbanization can result in both positive and negative synergies with ecosystem services. Land use changes associated with urban development often involve the conversion of natural habitats, agricultural lands, or wetlands into built-up areas. This loss of natural ecosystems results in the degradation or reduction of critical services. For instance, the loss of forests or wetlands can diminish water filtration and purification, increase stormwater runoff, and reduce habitat availability for biodiversity. Such trade-offs can have negative consequences for water quality, flood risk, climate resilience, and overall ecological functioning. Contrary, if well-planned urban development can incorporate green infrastructure, such as parks, urban forests, and green spaces, which provide multiple benefits. By integrating ecosystem services into urban design, cities can enhance livability and sustainability while providing important social, environmental, and economic benefits (Elmqvist et al., 2015). For example, India strives to achieve a remarkable urbanization rate of 60% by 2050, the Government of India is actively working to match this rapid urban transition. A key initiative in this endeavor is the ambitious Smart Cities Mission, which aims to overhaul 100 cities by modernizing their infrastructure. This transformation involves the application of cutting-edge technology to enhance essential urban services and improve living conditions. The Smart Cities Mission encompasses various aspects, including the development of eco-friendly infrastructure, the construction of energy-efficient buildings, and a strong emphasis on renewable energy sources. Ultimately, the mission's strategy revolves around the creation of well-integrated, livable, and sustainable cities that offer a high quality of life for all their residents.
Furthermore, green infrastructure and built infrastructure are two contrasting approaches to urban development, each with its own set of synergies and trade-offs when it comes to balancing urban development and ecosystem services. While the benefits of urban forests are widely acknowledged, understanding the specific contributions of trees in kerbside locations to human wellbeing and the local environment requires further exploration (Salmond et al., 2016). Developing comprehensive methodologies and frameworks for assessing their impact at this scale remains a challenge. Nonetheless, continued research and innovation in evaluating the net impact of trees in urban areas will be essential to inform effective decision-making and maximize the benefits derived from urban tree planting initiatives. Most studies on the benefits of street trees for human health and the urban environment have been conducted in isolated locations, and those that have been conducted have used overly simplistic methods. Street trees have far-reaching and interrelated effects on urban ecosystems, but these effects are typically overlooked by techniques that take a more general view of trees or focus primarily on individual benefits or drawbacks. Consequently, urban planners and policymakers may make decisions based on optimizing a single parameter, which can be problematic when a single action produces a wide range of outcomes, has many effects, and presents potential trade-offs in diverse settings (Salmond et al., 2016).
It is widely recognized that incorporating green infrastructure and urban greening practices into urban design can effectively mitigate the urban heat island effect. Nonetheless, to harness the full potential of urban forests and tree covers and optimize the benefits they offer, strategic planning becomes imperative. It is important to weigh the benefits of street trees during the day against their drawbacks at night and in the winter, as stated by Coutts et al. (2016). While trees do help mitigate nighttime heat loss, they also act as a radiation barrier within the urban canyon, making it harder for air to circulate and preventing sensible heat from building up during the day. A broad tree canopy can be beneficial during the day, but it may prevent the building from receiving sufficient longwave radiation at night, leading to warmer and uncomfortable conditions inside.
It is also important to remember that trees change the aerodynamic resistance to heat diffusion, which can prevent cool breezes from penetrating open windows on hot summer evenings (Salmond et al., 2016). Trees and the weather in an area interact in a mutually beneficial way. Maintaining tree canopies in good health and transpirational activity requires a steady supply of water. But unlike their forest cousins in the countryside, street trees in cities face a variety of hazards (Ferrini et al., 2014) which includes pollution, vehicular damage, vandalism, inadequate watering, soil compaction, pest attack, etc. There is a significant evaporative requirement because of the high temperatures, low humidity, and low soil moisture found in cities (Montague et al., 2000). The health and ability of street trees to cool metropolitan areas may be jeopardized if they are not provided with adequate irrigation to keep soil moist, support trees, and absorb excessive heat loads. Given the anticipated patterns of climate change in many urban locations, this scenario is of particular concern.
5.2. Socioeconomic equity and access to services
Socioeconomic equity and access to services are critical considerations in the context of balancing urban development and ecosystem services. Achieving a balance between these factors involves understanding the synergies and trade-offs associated with urban development and ensuring that the benefits of ecosystem services are accessible to all segments of society. Urban development can have both positive and negative impacts on socioeconomic equity and access to services. On one hand, well-planned urban development can lead to improved infrastructure, enhanced service provision, and increased opportunities for economic growth and social development. This includes access to basic services such as clean water, sanitation, healthcare, education, and transportation, which are essential for improving the quality of life for urban residents.
However, urban development can also create trade-offs and challenges in achieving equitable access to services. Rapid urbanization and land use changes often result in the displacement of marginalized communities, who may be forced to relocate to areas with limited access to essential services (Forbes, 2016). Forced urban displacements, especially slum removals, are often justified under the pretext of aesthetic reasons or the necessity to accommodate major events like international games, fairs, conferences, etc., according to research by the Habitat International Coalition, a non-governmental organization focused on housing policy matters. These measures, however, only benefit special interests rather than the general public and do little to solve the underlying housing crisis (Forbes, 2016). Furthermore, the development of certain urban areas may prioritize high-income neighborhoods, leaving lower-income communities with inadequate infrastructure and limited access to ecosystem services such as green spaces, clean air, and recreational opportunities. According to research conducted by Lara-Valencia and García-Pérez (2015), residents of low-income areas in the Mexican city of Hermosillo are disproportionately affected by the unequal distribution of public park space. Based on the findings, it appears that the struggle between globalized places and local public locations is becoming more pronounced as the city's economy gets more interwoven with global networks. As a result, this exacerbates the marginalization of communities that have unequal access to urban parks to begin with. In another instance, Guzman and Bocarejo (2017) conducted a case study in Bogota, Colombia, focusing on accessibility analysis for various income levels to the urban infrastructure. The study revealed that more than 80% of the low-income population faced significantly low accessibility indexes concerning their commute to work. These disparities in access likely play a pivotal role in the substantial variations in mobility observed among different socioeconomic groups. In particular, the study found that high-income groups made ~150% more trips compared to their low-income counterparts.
While the idea of the Smart Cities mission is widely embraced in India, there remains a notable lack of clarity in the concept note regarding its implications for the most marginalized sectors of society. It is of paramount importance to take into account urban ecosystem services, especially the affordable and publicly accessible provisioning services originating from urban commons, when formulating strategic plans for Indian cities. This approach can serve as a vital means to bolster the social and ecological resilience of the ever-expanding population of disempowered and underprivileged individuals residing in cities across India (Mundoli et al., 2017). The research conducted by Mundoli et al. (2017) highlights several crucial principles that should be integrated into the vision of smart cities. One such principle emphasizes the importance of preserving urban commons and the ecosystem services they offer as shared resources accessible to all members of society. Regrettably, there appears to be a growing trend among urban planners to redefine urban ecosystem services as economic commodities, thereby restricting their use to those with the financial means to afford these services. This shift in perspective is concerning. To address this challenge, it is imperative that our country embarks on a thoughtful and contextually aware reimagining of the concept and representation of urban commons. These areas should be considered as assets owned collectively by and for all citizens. To address these challenges, it is important to integrate principles of social equity into urban planning and decision-making processes. This involves prioritizing inclusive development, affordable housing, and mixed-income neighborhoods to ensure that all residents have access to essential services. Proactive measures should be taken to prevent the displacement of vulnerable communities and provide them with adequate support and opportunities for upward mobility. Promoting the equitable distribution of ecosystem services is also crucial. Green infrastructure and urban greening projects should be strategically implemented to benefit all communities, including those in socioeconomically disadvantaged areas. This can help reduce environmental inequalities and provide equal access to the multiple benefits that ecosystem services offer, such as improved health and wellbeing, enhanced resilience to climate change, and increased social cohesion. Community engagement and participation play a vital role in achieving socioeconomic equity and ensuring access to services. Inclusive decision-making processes that involve the voices of diverse stakeholders, including marginalized communities, can lead to more equitable outcomes. This can help identify specific needs, preferences, and priorities of different groups and guide the development of policies and interventions that address their unique challenges and aspirations. Therefore, by integrating principles of social equity into urban planning, preventing displacement, promoting mixed-income neighborhoods, and prioritizing the equitable distribution of ecosystem services, cities can create inclusive and sustainable environments that benefit all residents. A comprehensive and participatory approach is essential to address trade-offs and foster synergies between urban development, ecosystem services, and socioeconomic equity, leading to more resilient and thriving communities.
6. Policy and planning for sustainable urban ecosystem services and the existing challenges
Incorporating ecosystem services into urban planning is a crucial approach in policy and planning for sustainable urban ecosystem services since last 100 years. Policy and planning for sustainable urban ecosystem services involves several key aspects. Firstly, it requires recognizing and valuing the contributions of ecosystems to urban areas. This involves understanding the various ecosystem services provided by natural systems and quantifying their economic and social value. By incorporating this information into decision-making processes, policymakers and planners can prioritize the preservation and restoration of ecosystems within urban environments. Secondly, sustainable urban ecosystem services planning emphasizes the integration of green infrastructure into urban design (McPhearson et al., 2014). Additionally, policy and planning for sustainable urban ecosystem services necessitates collaboration among various stakeholders, including government agencies, community organizations, and private entities (Hansen et al., 2015). This collaborative approach ensures that diverse perspectives are considered and integrated into decision-making processes. It also fosters partnerships for implementing and maintaining green infrastructure, promoting shared responsibility for the sustainable management of urban ecosystems. Furthermore, monitoring and evaluation play a vital role in policy and planning for sustainable urban ecosystem services. Continuous monitoring of ecosystem conditions and the assessment of the effectiveness of interventions and policies help refine strategies and ensure that desired outcomes are achieved. By monitoring indicators related to ecosystem health, biodiversity, and the provision of ecosystem services, policymakers and planners can make informed decisions and adapt their strategies as needed.
Governance and stakeholder engagement are critical components of policy and planning for sustainable urban ecosystem services. Effective governance ensures that decision-making processes are transparent, inclusive, and participatory, while stakeholder engagement involves actively involving various stakeholders in the planning and implementation of policies related to urban ecosystem services. For instance, the study of Olsson et al. (2020) highlights the importance of involving various stakeholders in the decision-making process to achieve a just and honest urban ecosystem services governance that benefits the entire community and fosters long-term sustainable development in the Sofielund district in Malmö, Sweden. They conducted interviews with 16 stakeholders, including property owners or managers, businesses, and representatives from the Swedish Union of Tenants. The findings stress the need for inclusive and accountable governance of urban ecological services. Failure to take into account the interests of all parties involved could have resulted to one group's voice affecting urban development at the expense of others. The lack of a formal system for property owners to have input and communicate with the city government is a major obstacle. A different instance in Bogota, Colombia, highlights the susceptibility of local stakeholder involvement and cooperative management when faced with unstable government regulations concerning urban wetland management. In response to this precarious situation, local stakeholders have found legal actions to be the most effective strategy. These legal actions not only facilitate collaborative management but also safeguard their participation in the development and continuity of this management approach (Remolina, 2015). Thus, the governance and policy frameworks related to urban ecosystem services and climate change adaptation are often fragmented or inadequate. This highlights the fact that there is often a lack of coordination and collaboration among different sectors and stakeholders involved in urban ecosystem management. Climate change adaptation and mitigation strategies need to be better integrated into urban planning frameworks to ensure the effective management and enhancement of ecosystem services.
In another assessment, Kabisch (2015) uncovered how the ecosystem service framework is structured and implemented inside Berlin's existing urban green planning structure. This evaluation not only highlighted considerable difficulties in urban green governance, but also indicated the level of integration of the ecosystem service framework into the planning system. Although stakeholders are aware with the phrase, the examination of planning documents revealed that only recently established informal strategies expressly use the ecosystem service framework. Increasing development pressure due to population growth and municipal budget constraints, the loss of expertise, and a lack of communication leading to a lack of awareness of the benefits of green spaces among various stakeholders are the primary challenges facing urban green governance in Berlin. Such examples set out for the need of more coherent and integrated policies that explicitly address the linkages between climate change, urban development, and ecosystem services. Additionally, stronger coordination and collaboration between different levels of government and stakeholders are required to effectively address climate change impacts on urban ecosystems.
Furthermore, urban resilience and adaptation strategies in the context of policy and planning are crucial for cities to address and prepare for the challenges posed by various stressors and shocks. These strategies aim to enhance the ability of cities to withstand and recover from adverse events of climate change while maintaining essential functions and quality of life for their residents. Despite its great popularity, resilience has been shown in studies to occasionally lead to the maintenance of the current situation at the expense of social justice (Ziervogel et al., 2017). Further, it has the potential to accidentally lock in unsustainable growth patterns, leading to complex and underappreciated trade-offs at many spatial and temporal scales (Chelleri et al., 2015). This results in a governance gap (Wagenaar and Wilkinson, 2015) between the aspirational goal of resilience and the practical capacity to effectively control resilience at the urban level. When thinking about governance, the most effective method for bolstering urban resilience is to create a network of public institutions, government agencies, and private citizens working together to achieve common goals as part of a coordinated plan of action (Coaffee et al., 2009). However, municipal officials face substantial obstacles in accomplishing such objective. Furthermore, effective monitoring and evaluation systems are also lacking to assess the effectiveness of climate change adaptation measures and the provision of ecosystem services in urban areas. Thus, there is a need to develop standardized indicators and monitoring protocols to track changes in urban ecosystems and evaluate the success of climate change adaptation strategies. Public backing appears essential, particularly for consistent monitoring of habitat alterations and for their sustained engagement in the preservation and administration efforts. Furukawa (2013) research on the revitalized ecosystems of Shibaura Island and Yokoyama in Tokyo provides a prime illustration of the active participation of local residents from both urban and rural areas in the planning, implementation, and maintenance of these spaces. Kolkata's urban wetlands in India provide another example of success, primarily attributed to three factors: (1) diverse utilization of the ecosystem, (2) the harmony of urban ecological interactions, and (3) the powerful collaborative efforts of the community. This demonstrates how effective environmental and ecosystem governance relies on collective action and informal institutions as much as formal governance mechanisms (Hettiarachchi and Morrison, 2017). An additional instance of active involvement from the public, particularly students, can be observed in the upkeep of Hanul Madang, a rooftop garden located in Seoul city, South Korea as indicated in Table 2 (Son, 2018). Despite presenting positive case studies, it does not alter the harsh reality of ongoing social inequity in ecosystem service management and access which varies with regions and countries. However, ensuring that all communities, especially those most vulnerable to the impacts of climate change, have access to the benefits of ecosystem services can help alleviate some of the existing societal challenges in this context.
Another crucial aspect is the financing mechanisms that can play a significant role in supporting the enhancement of ecosystem services in urban areas. These mechanisms provide the necessary financial resources to implement projects and initiatives aimed at improving and maintaining the provision of ecosystem services. However, the deployment of green infrastructure faces extra hurdles due to the presence of financial constraints in many cities (Pataki et al., 2011). Cities can hardly afford to keep their current infrastructure running, let alone invest in researching, designing, building, and testing greener alternatives. Tree planting, stream daylighting (raising underground streams to the surface), and biofiltration project building are just a few examples of the ecosystem-services infrastructure efforts that many communities have turned to non-profits to implement in order to deal with this problem. This strategy, however, may result in complex public-private partnerships that are not sustainable over the long run due to grant cycles, inadequate nonprofit capacity, and other structural challenges (Svendsen and Campbell, 2008). Green bonds have emerged as a viable and attractive financing option that India, alongside other nations like China, the United States, Brazil, and many more across the globe, has actively embraced. India has been steadily advancing its commitment to environmentally sustainable project financing for an extended period. The demand for “green” financial products is on the rise, accompanied by a growing trend of investors declining to invest in companies that do not meet the evolving sustainability criteria. Consequently, financial service providers find themselves facing mounting pressure from both investors and rating agencies to establish effective strategies for sustainable management and conduct. Additionally, they now contend with new competitors who prioritize sustainability as a central element of their business models. In the context of the Indian banking sector, the government has introduced several laws and initiatives aimed at incentivizing lending to carbon-neutral enterprises and promoting environmentally friendly loans. These measures reflect a broader effort to align the financial sector with ecologically responsible practices (Bhatnagar et al., 2022).
7. Conclusion
In conclusion, the review highlights the importance of urban ecosystem services in the context of climate change and emphasizes the need for enhancing these services for effective adaptation. Urban ecosystems provide a range of benefits, including improved air and water quality, climate regulation, biodiversity conservation, and enhanced wellbeing for urban residents. However, climate change poses significant challenges to urban ecosystem services, including increased heat stress, flooding, and habitat loss. These impacts require proactive measures to enhance the resilience of urban ecosystems and ensure their continued provision of services. By incorporating nature-based solutions, such as green and blue infrastructure, cities can mitigate climate change effects, reduce vulnerabilities, and promote adaptation. It is essential to strike a balance between urban development and the preservation of ecosystem services. Synergies and trade-offs need to be carefully considered to avoid compromising the long-term sustainability and functionality of urban ecosystems. Integrating ecosystem services into policy and planning frameworks is crucial for sustainable urban development and effective climate change adaptation. Balancing urban development and ecosystem services requires an integrated approach that considers the long-term impacts on both human wellbeing and environmental health. This involves incorporating principles of sustainable development, such as compact city planning, mixed land-use zoning, and the protection and restoration of natural habitats. It also necessitates engaging stakeholders, including local communities, in decision-making processes to ensure their needs and perspectives are considered. Innovative planning and design strategies can help maximize synergies and minimize trade-offs. Nevertheless, challenges and gaps exist in the field of urban ecosystem services. Knowledge gaps, limited financial resources, governance and policy deficiencies, social equity considerations, and the need for robust monitoring and evaluation systems are significant challenges that must be addressed. These gaps call for increased research, innovative financing mechanisms, improved governance structures, and greater inclusivity and equity in decision-making processes. However, addressing these challenges and filling the gaps requires a multi-dimensional approach that combines scientific research, policy development, financial mechanisms, and community engagement. It calls for stronger collaboration among stakeholders, increased investment in urban ecosystem services, and the integration of climate change considerations into urban planning and governance processes.
Future research in the realm of urban ecosystem services and climate change should explore innovative approaches for enhancing urban resilience. This includes investigating the effectiveness of nature-based solutions in mitigating climate impacts, such as urban green infrastructure, green roofs, and sustainable urban planning strategies. Additionally, understanding the socioeconomic and equity implications of these solutions, as well as developing integrated assessment tools and models, will be critical for informed decision-making by urban policymakers. Furthermore, research should address emerging challenges related to climate-induced migration, urban heat island effects, and the preservation of biodiversity within cities. Ultimately, a holistic approach that combines ecological, social, and technological perspectives will be essential to create sustainable and climate-resilient urban environments.
Author contributions
BP: Methodology, Writing—original draft. AG: Conceptualization, Supervision, Writing—review and editing.
Funding
The author(s) declare no financial support was received for the research, authorship, and/or publication of this article.
Acknowledgments
BP expresses gratitude to the Director of CSIR-CIMFR for the provision of essential resources. AG extends appreciation to the Head of the Department of Life Sciences at Central University of Jharkhand, Ranchi, India, for facilitating necessary facilities. AG acknowledges the Department of Science and Technology (DST) INSPIRE division for their generous financial support in the form of the DST INSPIRE Faculty Fellowship (IFA22-LSPA 154).
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher's note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
Footnotes
1. ^Brooklyn Grange Farm. Brooklyn Grange. Available online at: https://www.brooklyngrangefarm.com (accessed August 6, 2023).
2. ^Gotham Greens. Available online at: https://www.gothamgreens.com/ (accessed August 17, 2023).
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Keywords: climate change, ecosystem services, resilience, sustainability, urban ecosystem
Citation: Pandey B and Ghosh A (2023) Urban ecosystem services and climate change: a dynamic interplay. Front. Sustain. Cities 5:1281430. doi: 10.3389/frsc.2023.1281430
Received: 22 August 2023; Accepted: 03 October 2023;
Published: 30 October 2023.
Edited by:
Saurabh Sonwani, University of Delhi, IndiaCopyright © 2023 Pandey and Ghosh. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Annesha Ghosh, anne19901900@gmail.com