AUTHOR=Sillanpää Mika Erik Tapio TITLE=Grand Challenges in Environmental Chemistry JOURNAL=Frontiers in Environmental Chemistry VOLUME=1 YEAR=2020 URL=https://www.frontiersin.org/journals/environmental-chemistry/articles/10.3389/fenvc.2020.00001 DOI=10.3389/fenvc.2020.00001 ISSN=2673-4486