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Could the EPA carbon rule give Obama political cover to approve the Keystone XL pipeline?

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President Obama, having just gained praise from environmental groups for the Environmental Protection Agency's new proposal to cut carbon emissions, may have the cover he needs to approve the Keystone XL pipeline. Robert Stavins, a Harvard University environmental economics professor, told U.S. News that the carbon rule would give Obama “leeway” on approving the pipeline. “The major...

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