around with the science. in the end you, have to go to court and justify these regulations. this is an administration that has done quite badly in court. they have been saved a coupe of times by the right wing judges. but so often the efforts to roll back regulations have been defeated in a court. so part of this push and pull insures that if you're going to do a regulatory change, it's done in way that is defensible. >> dan, in toto, how much of a threat is this? when you look at everything, the clean power rule, withdrawing from paris obviously, possibly open up the national forest in alaska, the methane rule, what does it add up to in terms of tangible material harm? >> this action here, against the minimum -- de minimis impact to industry economic impact bottom line, we're going get five million metric tons of methane pollution which could heat four