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共125条，第1-20条
Science X network 505 EurekAlert 495 Department of Conser 287
Science Daily 283 World Wide Fund for 266 International Union 162
EurekAlert! 159 Convention on Biolog 155 EurekAlert! - Earth 125
Global Environment F 114 Department of the En 103 United Nations Envir 102
Institute for Europe 69 Department for Envir 55 Environment and Clim 54
UN Sustainable Devel 54 World Resources Inst 53 World Business Counc 51
Scripps Institution 48 Wetlands Internation 44