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共84条，第1-20条
UN Sustainable Devel 154 us environmental pro 115 US Environmental Pro 102
World Resources Inst 102 EurekAlert 87 World Wide Fund for 87
Environmental Monito 67 Department of Conser 56 Federal Environment 53
US Geological Survey 49 Eco-Business Researc 45 United Nations Envir 44
United States Depart 41 Environmental Protec 40 Stockholm Internatio 40
The European Environ 38 World Business Counc 38 Imperial College Lon 35
UK Environment Agenc 34 US National Scientif 34