In this file photograph taken on Feb. 24, 2015, an activist waves a placard calling for the ban of fracking during a news conference outside the Colorado Convention Center in Denver as the Oil and Gas Task Force meets inside the facility to put the final touches on recommendations for Colorado Gov. John Hickenlooper to consider in the settlement of disputes over oil and gas well development. The Colorado Supreme Court will hear arguments Wednesday, Dec. 9, 2015, in a high-stakes battle over whether local governments can impose tougher rules on oil and gas producers than the state. (AP Photo/David Zalubowski, File)
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