A study by the Environmental Defense Fund and ICF International found that stopping methane leaks from exploration wells can help oil and natural gas drillers reduce methane emissions by 40% for $2.2 billion. The captured gas can be sold to offset the cost. "There is huge opportunity here for little or no cost. In some ways, moving industry in this direction is going to actually help industry be more productive and more profitable," said Environmental Defense Fund chief counsel Mark Brownstein.

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