FILE- In this Dec. 2, 2017, photo former President Obama gives a speech in Paris. Obama is expected to attend a gathering of mayors from around the globe convening in Chicago to discuss climate change after President Donald Trump said the U.S. will pull out of the Paris climate accord. Chicago Mayor Rahm Emanuel released a statement Monday, Dec. 4, saying he's honored Obama will be joining the North American Climate Summit Chicago. (AP Photo/Thibault Camus, File)
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