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WASHINGTON, DC - FEBRUARY 17: Michael Brune attends 'Forward On Climate' Washington DC Rally on February 17, 2013 in Washington, DC. (Photo by Leigh Vogel/Getty Images)

WASHINGTON, DC - FEBRUARY 17: Michael Brune attends 'Forward On Climate' Washington DC Rally on February 17, 2013 in Washington, DC. (Photo by Leigh Vogel/Getty Images)