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共82条，第1-20条
United States Depart 756 EurekAlert 384 RAND Corporation 332
Seismological Societ 278 World Resources Inst 218 World Business Counc 149
UN Sustainable Devel 132 Science 122 us environmental pro 106
Center for Strategic 100 Convention on Biolog 97 US Environmental Pro 67
United Nations Envir 67 Environmental Protec 53 World Wide Fund for 51
Scripps Institution 44 UN-Habitat 41 Bureau of Ocean Ener 38
Environmental Health 38 Global Environment F 38