As Sharon Wilson pulled up to the BP site in Texas last June, production tanks towered above the windblown grass roughly 60 miles southeast of San Antonio. Cows and pumpjacks lined the roadsides.
All looked placid. But when Wilson flipped on a high-tech video camera, a disquieting image became visible: A long black plume poured from a flare pipe. Her camera, designed to detect hydrocarbons, had revealed what appeared to be a stream of methane — a potent climate-warming gas, gushing from the very equipment that is supposed to prevent such emissions.
