ExxonMobil Corp. has launched a plan to curb methane leaks from its shale oil and gas operations, taking unilateral action on an issue that has been the subject of sustained political and legal battles in the U.S. in recent years.

XTO Energy Inc., Exxon’s shale subsidiary, will replace equipment, train staff and research new technologies to curb leaks of methane, a potent greenhouse gas estimated to trap heat 28 to 36 times as effectively as carbon dioxide over 100 years.

ExxonMobil’s move comes even though the Trump administration is working to roll back or suspend regulations imposed under President Barack Obama to control methane leakage.

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