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How Obama's new emissions rules will likely shape the White House race

With Monday's release of landmark rules to combat global warming, President Obama is putting into place what probably will be the last piece of his ambitious second-term agenda – one that highlights deep divisions in the country and helps shape the race to succeed him.

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Obama to impose deeper cuts in greenhouse gas emissions

President Obama will impose even steeper cuts on greenhouse gas emissions from U.S. power plants than previously expected, White House officials said early Sunday, in what the president called the most significant step the country has ever taken to fight global warming.