we have use that authority time tuter time, ly i think more than 100 times, to set more stringent rules about the air pollution coming out of tailpipes. about 10 ars ago we arted to expand that authority to include greenhouse gas emissions that are emitted by cars and trucks. and, one thing that trump is doing is saying that the decision to allow that was sia erpretation of the clean airact. i think there will be a big fight in cothe ts about whether tathat reinterpon of the law is permissible are not. and i think we will have to see how it turns out. what trump is doing is revoking our current permission to have a stricter standard. we have set standards, actually twice, to limit tailpipe emco2 sions, greenhouse gas emissions, and trump has said that the current permitthat california has essentially to set its own rules for carbon dioxide has been revoked. and, the interesting question here is there is no permission to revoke this kind of special waiver in the clean air act. so, there is no controlling la and there is a lot of reliance, the states and auto manufacturers have assumed th