Five electric utilities, including American Electric Power, Xcel Energy and Duke Energy, have asked the U.S. Supreme Court to reverse a lower court's decision that opens them to litigation relating to health problems stemming from carbon dioxide emissions. "Such a claim could be pursued by anyone who claims to be affected by climate change against any source of greenhouse-gas emissions. ... And, it would result in a patchwork of conflicting regulation of greenhouse-gas emissions, undermining any federal interest in coordinated emissions standards," the companies' lawyers argued in a brief.

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