keep in mind also that our grouse gas emissions in the united states are on a downward trendre, y. >> woodruff: to that point, scientis, though, are saying they see emissions overall as aringreater than what is healthy, what is good for society, theyh see te trend as going in a dangerous direction. >> right, and what we can say that is we are on a downward trajectory. we are improving. things have improved over the past few decades.tr if wto make our mandates so strong it essentially stops ople from driving, that halts our economy, keeps people from their jobs. i guesthe question is what cost are we willing to pay, and we think we can find ala reasonablece between being stewards of our environment and also allowing people to live their eveday lives to succeed, to prosper and to use their vehicle to travel around as needed. so we'd liikke to s a balance on that. >> woodruff: the auto manufacturers,they don't seem particularly enthusiastic about what the trump administration has announ they're saying today, we'll try to work this out, but they don't like the idea of two different sets o