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UNITED STATES - JULY 7: Lilyana Distler, 4, of Waldorf, Md., holds a sign during a "play-in" protest by kids and mothers in Upper Senate Park organized by Moms Clean Air Force, July 7, 2015. About 400 gathered to support the EPA's Clean Power Plan and call attention to climate change and air pollution. (Photo By Tom Williams/CQ Roll Call)

UNITED STATES - JULY 7: Lilyana Distler, 4, of Waldorf, Md., holds a sign during a "play-in" protest by kids and mothers in Upper Senate Park organized by Moms Clean Air Force, July 7, 2015. About 400 gathered to support the EPA's Clean Power Plan and call attention to climate change and air pollution. (Photo By Tom Williams/CQ Roll Call)

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