selling album in history. [ oswald ] there's a lot of discussion going on about the development of natural gas, whether it can be done safely and responsibly. at exxonmobil we know the answer is yes. when we design any well, the groundwater's protected by multiple layers of steel and cement. most wells are over a mile and a half deep so there's a tremendous amount of protective rock between the fracking operation and the groundwater. natural gas is critical to our future. at exxonmobil we recognize the challenges and how important it is to do this right.