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共79条，第1-20条
United States Depart 756 EurekAlert 384 RAND Corporation 323
Seismological Societ 278 World Resources Inst 218 World Business Counc 149
UN Sustainable Devel 132 Science 122 us environmental pro 106
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 Imperial College Lon 30