UN Climate Change Summit Enters Final Week

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U.S.President Barack Obama shakes hands with his Russian counterpart... News PhotoBarack Obama,Car,Copenhagen,Counterpart,Denmark,Dmitry Medvedev,Environmental Issues,Event,Handshake,Horizontal,Human Hand,Oresund Region,Politics,US President,United NationsPhotographer Collection: Getty Images News 2009 Konstantin ZavrazhinCOPENHAGEN, DENMARK - DECEMBER 18: U.S.President Barack Obama (R) shakes hands with his Russian counterpart Dmitry Medvedev after the session of United Nations Climate Change Conference December 18, 2009 in Copenhagen, Denmark. World leaders will try to reach agreement on targets for reducing the earth's carbon emissions on this last day of the summit. (Photo by Konstantin Zavrazhin/Getty Images)