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共100条，第1-20条
Science X network 197 EurekAlert 150 Science Daily 68
EurekAlert! - Earth 63 EurekAlert! 49 World Wide Fund for 39
World Resources Inst 25 UN Sustainable Devel 23 Science 21
Center for Strategic 18 Environment & Energy 12 Environmental Monito 12
Canadian Institute o 10 Centre national de l 10 RAND Corporation 10
The Associated Press 10 Department of Conser 9 Eco-Business Researc 9
UK Environment Agenc 9 Potsdam Institute fo 8