Infographic illustration depicting the world's 20 greenest countries as ranked by Yale?檚 Environmental Performance Index (EPI). The EPI ranks 180 countries on variety of environmental sustainability factors. Denmark ranks first overall as it leads the world in slowing its growth in CO2 emissions. Sweden leads in landfill and recycling treatment. Wastewater treatment is led by a handful of countries including Denmark, Finland, the Netherlands, Singapore, and Sweden. Canada claims top spot in the biodiversity and habitat category, while the U.S. ranks sixth in agricultural diversity globally. In Asia, Singapore leads the world in fishery health and sustainability. Figures based on 2020 data from the EPI.