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Scattered throughout the U.S. are millions of old oil and gas wells with no known operator. They\u2019re a major source of methane emissions and can leak contaminants into the groundwater. But it\u2019s hard to locate these wells, as many were drilled before modern mapping and recordkeeping technologies became widespread. It\u2019s going to cost billions to clean them up, but for the first time there\u2019s major federal funding devoted to doing just that.