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共65条，第1-20条
EurekAlert 89 United States Depart 56 Commonwealth Scienti 51
Minging.com 32 Science Daily 25 U.S. Energy Informat 18
World Resources Inst 15 EurekAlert! 12 The European Environ 11
US Geological Survey 11 EurekAlert! - Earth 10 UN Sustainable Devel 8
Scientific American 7 Department of Energy 6 Institute for Europe 6
The Copernicus Progr 6 World Business Counc 6 Science 5
United Nations Food 5 Global Environment F 4