Associated Press
FILE - Policemen patrol outside the main entrance of the United Nations Climate Change Conference in Le Bourget, outside Paris, Saturday, Nov. 28, 2015. The site of Paris-Le Bourget will officially become United Nations territory for the COP 21 conference which is scheduled to start on Nov. 30.   President Barack Obama heads to a historic conference in Paris hoping to marshal strong global action against climate change.  (AP Photo/Laurent Cipriani, File)

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