I feel responsible; I feel I've got to do something that will leave the kids a place where they can live healthy, safe, productive, creative and prosperous lives.

If we were driving pure hydrogen automobiles, that automobile would actually help clean up the air because the air coming out of the exhaust would be cleaner than the air going into the engine intake.

We're the only species that have crapped up the planet and the only species that can clean it up.

It's not an if - we're going to have to change. Oil is simply going to be gone.

The people of the future will say, 'meat-eaters!' in disgust and regard us in the same way that we regard cannibals and cannibalism.

We don't have to sacrifice a strong economy for a healthy environment.

When we realize we can make a buck cleaning up the environment, it will be done!