Presidential contenders differ sharply on climate,

FILE - In this Nov. 3, 2015 file photo, the Keystone Steele City pumping station, into which the planned Keystone XL pipeline is to connect to, is seen in Steele City, Neb. Differences between the two parties on energy and climate issues are stark and suggest sharp contrasts in how Republicans and Democrats will address energy and environmental issues depending on who wins the White House next November. Republicans unanimously support the recently rejected Keystone XL oil pipeline from Canada, for instance, while Democrats oppose it. Republicans agree on lifting the 40-year export oil ban, a stance Democrats oppose. (AP Photo/Nati Harnik)WASHINGTON (AP) — Democratic presidential candidate Bernie Sanders calls climate change the greatest threat to national security. Front-runner Hillary Rodham Clinton promises to install more than 500 million solar panels across the country.

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