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共31条，第1-20条
World Wide Fund for 30 World Resources Inst 15 EurekAlert 8
Eco-Business Researc 6 United States Depart 6 Global Environment F 5
International Union 5 Science 5 Cary Institute of Ec 4
Convention on Biolog 4 Department of Conser 4 Institute for Europe 2
Scripps Institution 2 Stockholm Internatio 2 Association of Ameri 1
Australian Academy o 1 Australian Bureau of 1 Center for Internati 1
Environmental Monito 1 Environmental Protec 1