World Economic Forum (WEF) Global Leaders for Tomorrow Environment Task Force, Yale Center for Environmental Law and Policy (YCELP)/Yale University, and Center for International Earth Science Information Network (CIESIN)/Columbia University (2001), 2001 Environmental Sustainability Index (ESI), Yale Center for Environmental Law and Policy (YCELP)/Yale University, New Haven, CT,
http://sedac.ciesin.columbia.edu/data/set/esi-environmental-sustain... Yale Center for Environmental Law and Policy (YCELP)/Yale University, Center for International Earth Science Information Network (CIESIN)/Columbia University, and World Economic Forum, and Joint Research Centre (JRC)/European Commission (2005), 2005 Environmental Sustainability Index (ESI), Yale Center for Environmental Law and Policy (YCELP)/Yale University, New Haven, CT,
http://sedac.ciesin.columbia.edu/data/set/esi-environmental-sustain... World Economic Forum (WEF) Global Leaders for Tomorrow Environment Task Force, Yale Center for Environmental Law and Policy (YCELP)/Yale University, and Center for International Earth Science Information Network (CIESIN)/Columbia University (2002), 2002 Environmental Sustainability Index (ESI), Yale Center for Environmental Law and Policy (YCELP)/Yale University, New Haven, CT,
http://sedac.ciesin.columbia.edu/data/set/esi-environmental-sustain...