Exxon Mobil Corp. will offer some of its Permian Basin shale gas for certification by a nonprofit that assesses methane leaks, a move that comes as the oil industry faces unprecedented pressure to clamp down on emissions. About 200 million cubic feet per day of gas produced from Exxon’s marquee Poker Lake development in New Mexico will be graded by MiQ, a partnership between Systemiq, which describes itself as a global sustainability consultancy, and RMI, formerly the nonprofit Rocky Mountain Institute . That’s about 7% of Exxon’s total U.S. gas output. Certified gas could be available by the fourth quarter, the Irving, Texas-based company said Tuesday in a statement . Energy companies including Exxon are keen to tout natural gas as a green fuel of the future because it produces far fewer emissions than coal at the point of burning. But methane leaks from production sites, compressor stations and […]