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President Obama moves to greet guests after delivering remarks at a reception celebrating the reauthorization of the African Growth and Opportunity Act (AGOA) in the East Room of the White House, July 22, 2015. (Photo by Chip Somodevilla/Getty)

Obama's 'biggest step' on climate

The United States will take a giant stride in the race to prevent catastrophic climate change Monday, limiting — for the first time ever — the amount of carbon power plants can pump into the atmosphere, according to senior administration officials. ...

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