Sierra Club volunteer Alex Burke organizes signs to hand out near the local Environmental Protection Agency offices, on the first of two days of public hearings held by the EPA on President Barack Obama's plan to cut carbon dioxide emissions by 30 percent by 2030, in Denver, Tuesday, July 29, 2014. In hearings, hundreds of people across the country are telling the EPA its new rules for power-plant pollution either go too far or not far enough. (AP Photo/Brennan Linsley)
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