EnvironmentUS operators leak methane four times higher than estimated, EDF survey showsTwelve major US basins losing gas at a 1.6% rate, or 7.5 million tonnes per annumA drilling rig operates in the Permian basin in Lea County, New Mexico, USA, on 10 February 2019.Photo: NICK OXFORD/REUTERS/SCANPIXRobert StewartNorth America Energy CorrespondentBaton Rouge
