Guardian: When Stephen Conley, an atmospheric scientist and pilot, saw an emissions indicator skyrocket in his Mooney TLS prop plane, he knew he had found a significant methane leak. His gas-detecting Picarro analyzer indicated he was flying through a plume of gas escaping at 900kg per hour. The colorless, odorless gas was enough to cover a football field to a height of 20 feet in a single day. But this flight wasnt over the highly publicized Aliso Canyon in Los Angeles; Conley was circling the Bakken Shale,...