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共108条，第1-20条
EurekAlert 185 Science X network 139 United States Depart 114
Minging.com 85 Science Daily 64 Commonwealth Scienti 54
UN Sustainable Devel 52 U.S. Energy Informat 42 World Resources Inst 41
EurekAlert! 40 US Geological Survey 35 EurekAlert! - Earth 32
World Business Counc 32 The European Environ 22 Institute for Europe 19
Woods Hole Oceanogra 15 World Wide Fund for 14 Alfred Wegener Insti 11
Natural Resource can 11 Scripps Institution 11