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共83条，第1-20条
EurekAlert 1236 Science Daily 386 United States Depart 377
Science 267 US Environmental Pro 241 RAND Corporation 219
Department of Energy 213 EurekAlert! - Earth 183 Environment & Energy 178
EurekAlert! 158 U.S. Energy Informat 156 us environmental pro 149
Scientific American 128 The Associated Press 100 World Resources Inst 95
Minging.com 88 Environmental Health 66 US Geological Survey 59
Massachusetts Instit 44 NASA Global Climate 36