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共180条，第1-20条
EurekAlert 586 Science X network 484 World Business Counc 246
Science Daily 228 Institute for Europe 199 EurekAlert! 176
World Resources Inst 156 EurekAlert! - Earth 143 United Nations Envir 140
Asian Development Ba 137 Global Environment F 110 Natural Environment 98
us environmental pro 98 World Wide Fund for 88 US Environmental Pro 83
Imperial College Lon 77 future earth 75 Department for Envir 65
world meteorological 64 UN Sustainable Devel 63