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WASHINGTON, DC - NOVEMBER 04: Democratic presidential candidate Sen. Bernie Sanders (I-VT) delivers remarks during a news conference introducing the 'Keep Fossil Fuels in the Ground Act of 2015Ó outside the U.S. Capitol November 4, 2015 in Washington, DC. The act, which has little chance of passing in the U.S. Congress, would prohibit 'the issuance of new leases or renewal of non-producing leases for coal, oil and natural gas on all federal lands and waters.' (Photo by Win McNamee/Getty Images)

WASHINGTON, DC - NOVEMBER 04:  Democratic presidential candidate Sen. Bernie Sanders (I-VT) delivers remarks during a news conference introducing the 'Keep Fossil Fuels in the Ground Act of 2015Ó outside the U.S. Capitol November 4, 2015 in Washington, DC. The act, which has little chance of passing in the U.S. Congress, would prohibit 'the issuance of new leases or renewal of non-producing leases for coal, oil and natural gas on all federal lands and waters.'  (Photo by Win McNamee/Getty Images)