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US Senator and Democratic presidential candidate Bernie Sanders unveils landmark climate legislation on Capitol Hill in Washington, DC, on November 4, 2015. Sanders and fellow Senator Jeff Merkley (R) are calling on the federal government to end future leases of public land to extract fossil fuels, and for the suspension of current leases which are not producing. AFP PHOTO / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)

US Senator and Democratic presidential candidate Bernie Sanders unveils landmark climate legislation on Capitol Hill in Washington, DC, on November 4, 2015. Sanders and fellow Senator Jeff Merkley (R) are calling on the federal government to end future leases of public land to extract fossil fuels, and for the suspension of current leases which are not producing.   AFP PHOTO / JIM WATSON        (Photo credit should read JIM WATSON/AFP/Getty Images)