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In this 2010 photo, steam rises from towers at an Exxon Mobil refinery in Baytown, Texas. Recently leaked memos from Exxon Mobil have shown that the company knew about climate change as early as 1981 but still funded deniers. Pat Sullivan/ASSOCIATED PRESS hide caption

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Pat Sullivan/ASSOCIATED PRESS

Visitors to the Ah-Tah-Thi-Ki Seminole Museum regard a letter dated February 9, 1774 on display in 2006. The letter was written by John Moultrie, the Lieutenant Governor of then British East Florida and addressed to 'The Cowkeeper, the founder of the Seminole Tribe of Florida' in which Moultrie asks The Cowkeeper for peace between the Seminoles and the British. Joe Raedle/Getty Images hide caption

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Joe Raedle/Getty Images