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共120条，第1-20条
EurekAlert 209 Science X network 177 World Resources Inst 115
United States Depart 79 Science Daily 77 Institute for Europe 65
World Business Counc 62 Intergovernmental Pa 61 EurekAlert! 53
Department for Envir 52 UN Sustainable Devel 52 World Wide Fund for 38
United Nations Envir 36 United Nations Food 33 Global Environment F 32
gov.uk-Department fo 31 world meteorological 31 EurekAlert! - Earth 29
RAND Corporation 28 SciDev.Net 28