The New York Times reported that at the United Nations climate summit, Vice President Kamala Harris said a new final rule put in place by the Environmental Protection Agency will heavily curb energy companies’ methane emissions.

The EPA said in a press release that this rule will mean “a nearly 80 percent reduction” of methane, a far more potent greenhouse gas than carbon dioxide.

As the Times notes, 50 oil and gas companies pledged similar reductions, though environmental groups are skeptical. In an open letter, 320 organizations signed an open letter criticizing the “voluntary efforts” as a “distraction from the task at hand.”