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共53条，第1-20条
Environment & Energy 184 EurekAlert 135 Science Daily 79
World Wide Fund for 54 Department of Conser 33 EurekAlert! 23
EurekAlert! - Earth 20 Convention on Biolog 17 Global Environment F 17
Environmental Health 15 Commonwealth Scienti 14 Science 13
United Nations Envir 12 Department for Envir 11 The Associated Press 11
Department of the En 9 NewScientist 8 International Union 7
Environmental Protec 6 UK Environment Agenc 5