President Barack Obama speaks about climate change, Tuesday, June 25, 2013, at Georgetown University in Washington. 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. (AP Photo/Charles Dharapak)

Associated Press
President Barack Obama speaks about climate change, Tuesday, June 25, 2013, at Georgetown University in Washington. 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. (AP Photo/Charles Dharapak)
President Barack Obama speaks about climate change, Tuesday, June 25, 2013, at Georgetown University in Washington. 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. (AP Photo/Charles Dharapak)
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