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共100条，第1-20条
Department of Conser 1212 World Wide Fund for 628 Convention on Biolog 429
EurekAlert 373 International Union 326 United States Depart 290
United Nations Envir 156 Global Environment F 139 us environmental pro 130
World Resources Inst 126 Department for Envir 124 Department of the En 118
Government of Canada 111 Scripps Institution 101 World Business Counc 82
Institute for Europe 81 UN Sustainable Devel 77 UK Environment Agenc 73
Science 72 US Geological Survey 67