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.

Business has to change the way it does business, or we will make no significant changes in the way we relate to the earth.

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.

A sure way to lose happiness, I found, is to want it at the expense of everything else.

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

If we had a hydrogen economy worldwide, every nation on earth could create its own energy source to support its economy, and the threat of war over diminishing resources would just evaporate.