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September 19, 2014

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President Barack Obama speaks in front of Old North, Georgetown University's oldest building, about climate change at Georgetown University in Washington, Tuesday, June 25, 2013. The president is proposing sweeping steps to limit heat-trapping pollution from coal-fired power plants and to boost renewable energy production on federal property, resorting to his executive powers to tackle climate change and sidestepping the partisan gridlock in Congress.

Charles Dharapak / AP

President Barack Obama speaks in front of Old North, Georgetown University's oldest building, about climate change at Georgetown University in Washington, Tuesday, June 25, 2013. The president is proposing sweeping steps to limit heat-trapping pollution from coal-fired power plants and to boost renewable energy production on federal property, resorting to his executive powers to tackle climate change and sidestepping the partisan gridlock in Congress.