The 2008 Environmental Performance Index (EPI) ranks 149 countries on 25 indicators tracked across six established policy categories: Environmental Health, Air Pollution, Water Resources, Biodiversity and Habitat, Productive Natural Resources, and Climate Change. The EPI identifies broadly-accepted targets for environmental performance and measures how close each country comes to these goals. The EPI focuses on two overarching environmental objectives:
- reducing environmental stresses to human health
- promoting ecosystem vitality and sound natural resource management.
Botswana's overall score for 2008 is 98 in a range of 1 (Switzerland) to 149 (Niger); Namibia scored 88, Angola, 148.
The EPI is the result of collaboration among Yale Center for Environmental Law and Policy, the Center for International Earth Science Information Network , the World Economic Forum, and the Joint Research Centre (JRC) European Commission.