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Obama pledges carbon limits at power plants, says Keystone can’t raise greenhouse gases

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President Obama on Tuesday called for the first-ever U.S. limits on carbon emissions at existing power plants and vowed to block the Keystone XL pipeline if its construction would exacerbate greenhouse gases, outlining a series of executive actions to combat climate change and igniting a fierce debate over environmental policy in Washington. “Today, for the sake of our children and the...