Yale Center for Environmental Law and Policy (YCELP)/Yale University, Center for International Earth Science Information Network (CIESIN)/Columbia University, World Economic Forum (WEF), and Joint Research Centre (JRC)/European Commission (2006), Pilot 2006 Environmental Performance Index (EPI), Yale Center for Environmental Law and Policy (YCELP)/Yale University, New Haven, CT,
http://sedac.ciesin.columbia.edu/data/set/epi-pilot-environmental-p... Yale Center for Environmental Law and Policy (YCELP)/Yale University, Center for International Earth Science Information Network (CIESIN)/Columbia University, World Economic Forum (WEF), Joint Research Centre (JRC)/European Commission (2010), 2010 Environmental Performance Index (EPI), Yale Center for Environmental Law and Policy (YCELP)/Yale University, New Haven, CT,
http://sedac.ciesin.columbia.edu/data/set/epi-environmental-perform...