In this June 12, 2014 file photo, natural gas is burned off near pumps in Watford City, N.D. As Trump rolls back some Obama-era rules on climate-changing methane pollution, Colorado officials say their regulations have reduced oil field leaks. A report released Thursday, Aug. 23, 2018, shows required state inspections helped find and repair 73,000 methane leaks over three years. (AP Photo/Charles Rex Arbogast, File)
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