One of the early, attention-grabbing announcements at November’s COP climate conference in Glasgow was a commitment by more than 105 countries to join a U.S.- and E.U.-led coalition to cut 30% of methane emissions by 2030. The potent greenhouse gas, which is up to 80 times more effective at heating the planet than carbon dioxide in the short term, has often been considered the lowest hanging fruit when it comes to slowing down global warming.