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共120条，第1-20条
Science X network 523 EurekAlert 384 Department of Conser 364
Science Daily 210 World Wide Fund for 142 EurekAlert! 128
United States Depart 128 EurekAlert! - Earth 110 World Resources Inst 90
Global Environment F 83 International Union 67 United Nations Envir 50
World Business Counc 50 Environmental Monito 47 gov.uk-Department fo 47
UN Sustainable Devel 44 Environment and Clim 41 Department for Envir 40
Institute for Europe 33 Environment & Energy 32