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共24条，第1-20条
RAND Corporation 10 EurekAlert 9 Center for Strategic 7
Commonwealth Scienti 5 United States Depart 4 Massachusetts Instit 3
Cary Institute of Ec 2 Eco-Business Researc 2 Imperial College Lon 2
SciDev.Net 2 Science 2 Scripps Institution 2
Australian Bureau of 1 Bruegel 1 Department for Busin 1
European Centre for 1 European Space Agenc 1 Science Daily 1
The Associated Press 1 The Copernicus Progr 1