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共90条，第1-20条
us environmental pro 57 Science X network 51 gov.uk-Department fo 39
World Business Counc 38 Environmental Monito 37 EurekAlert 35
United States Depart 32 World Wide Fund for 28 Department for Envir 27
Water Environment Fe 20 Environment and Clim 19 World Resources Inst 18
Science Daily 15 US Environmental Pro 15 United Nations Envir 15
Government of Canada 14 The Water Council 14 Environmental Protec 11
Eco-Business Researc 10 EurekAlert! 10