FILE - In this March 29, 2013, file photo, a worker helps monitor water pumping pressure and temperature, at an oil and natural gas extraction site, outside Rifle, on the Western Slope of Colorado. A Trump administration national security official has sought help from advisers to a think tank that disavows climate change to challenge widely accepted scientific findings on global warming, according to his emails. (AP Photo/Brennan Linsley, File)
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