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共96条，第1-20条
United States Depart 756 EurekAlert 384 RAND Corporation 332
Seismological Societ 278 Center for Strategic 249 World Resources Inst 221
World Business Counc 149 UN Sustainable Devel 132 Science 122
us environmental pro 106 Convention on Biolog 97 United Nations Envir 83
US Environmental Pro 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