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EurekAlert 213 World Resources Inst 209 UN-Habitat 139
RAND Corporation 137 World Wide Fund for 135 Department of Conser 122
United States Depart 113 UN Sustainable Devel 97 World Business Counc 94
UK Environment Agenc 90 Imperial College Lon 79 Science 79
us environmental pro 75 Department for Envir 72 gov.uk - environment 71
United Nations Envir 67 Global Environment F 66 Scripps Institution 50
future earth 48 US Environmental Pro 46