Science is really about describing the way the universe works in one aspect or another in all branches of science-how a life-form works, how this works, how that works. ... You have to have a natural curiosity for that.

Switching to light-coloured roofs and roadways would have the equivalent effect on greenhouse gas emissions to taking one billion cars off the road for eleven years.

Just refrigerator efficiency saves more energy than all that we're generating from renewables, excluding hydroelectric power... I cannot impress upon you how important energy efficiency is. It doesn't mean you eat lukewarm food and your beers are lukewarm. You can still have it; you just make a better thing

Sustainable energy is the equivalent of the U.S. moon shot.

I believe [the Department of Energy] should be judged not by the money we direct to a particular State or district, company, university or national lab, but by the character of our decisions. The Department of Energy serves the country as a Department of Science, a Department of Innovation, and a Department of Nuclear Security.

Education in my family was not merely emphasized, it was our raison d'etre.

If there is a regulation that says you have to do something-whether it be putting in seat belts, catalytic converters, clean air for coal plants, clean water-the first tack that the lawyers use, among others things, and that companies use, is that it's going to drive the electricity bill up, drive the cost of cars up, drive everything up. It repeatedly has been demonstrated that once the engineers start thinking about it, it's actually far less than the original estimates. We should remember that when we hear this again, because you will hear it again.