The U.S. Environmental Protection Agency’s regulation aimed at significantly curtailing methane emissions over the next 15 years is likely to face legal challenges, environmental law experts said. 

“In the last few years, people really began to appreciate the importance of methane as part of the climate problem,” said Daniel Farber, a law professor at the University of California, Berkeley. The rule “recognizes that reducing methane is one of the things that we can do quickly and at a relatively low expense that will have a real impact on the problem.”