FILE - This June 25, 2013 file photo shows President Barack Obama wiping perspiration from his face as he speaks about climate change at Georgetown University in Washington. The Obama administration is poised to unveil first-ever rules limiting greenhouse gas emissions from the power plants that dot the U.S. map. President Barack Obama says the rules are essential to curb climate change, but critics disagree. (AP Photo/Charles Dharapak, File)
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