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

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.

The earth is a tremendous gift. There is nothing else like it in the known universe. I want to leave it the way I found it.

War is usually fought over diminishing resources, particulary those that we perceive to be extremely valuable.

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.

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

Whatever we'll be forced to do later, we should be doing now.