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共90条，第1-20条
EurekAlert 134 Science X network 115 Minging.com 70
RAND Corporation 59 UN Sustainable Devel 58 EurekAlert! - Earth 53
World Resources Inst 50 EurekAlert! 40 Science Daily 40
United States Depart 31 Science 22 Convention on Biolog 14
World Business Counc 11 Seismological Societ 10 Environmental Protec 9
United Nations Envir 9 Department of Energy 8 Environmental Health 8
Global Wind Energy C 8 International Energy 8