AUTHOR=Frontiers Editorial Office TITLE=Expression of concern: Globally, freshwater ecosystems emit more CO2 than the burning of fossil fuels JOURNAL=Frontiers in Environmental Science VOLUME=10 YEAR=2022 URL=https://www.frontiersin.org/journals/environmental-science/articles/10.3389/fenvs.2022.1043069 DOI=10.3389/fenvs.2022.1043069 ISSN=2296-665X