I'm sure that in the fullness of time we'll learn that one or more of these seemingly promising technologies were dead ends. And that's the nature of innovation, and that's why we should spread our bets; we should not put our eggs in any one basket. Some of these will be grand successes, some of them will be average, and some of them will be abject failures.

I talk about reducing our dependence on foreign oil. If we're buying electricity from a solar-thermal plant in Tijuana, I'm not sure we should say that's evil. If we are buying wind power from Alberta, I don't have a huge objection to that.

We must start... rebuilding our cities around energy efficiency and human needs, rather than around the car and wasted energy.

We clearly need to break our addiction on Saudi Arabian oil that is a security threat to the United States.

We can't tell China what to do if we don't do it ourselves. You don't inspire someone to take an action by refusing to take it yourself. We are in a race to be the dominant clean-energy provider to the world. Maybe this goes without saying: We've got to get China into an international protocol and the magic words are "common responsibility with differentiated action."

Healing is a moral thing to do.

But most importantly, we can all be donors. It does not matter how old you are, your race, where you live; all of us can give the gift of life.