Chevron Corp. is doubling down on its plan to turn cow manure into renewable natural gas. The oil major formed a joint venture with waste solutions manager Brightmark LLC to build biomethane projects in multiple states, marking its second foray into producing renewable gas from dairy waste. Chevron plans to then buy the biomethane to power its trucks, buses and other vehicles currently running on compressed natural gas, according to an emailed statement. “We think this is part of the way we are going to have lower carbon fuel in the future,” Andy Walz, president of Americas products at Chevron, said in a telephone interview. The ultimate goal, he said, is to lower its emissions. The push comes as fossil-fuel producers are under mounting pressure to be more transparent about their […]