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

I became a vegetarian in 1958 and it was very difficult in those days to really maintain that because there weren't many options... alternatives. But, now, it's a growing trend because... the economics are there. See, there's simply enough people demanding it that it's profitable to supply vegetarians with those products.

The Age of Oil has really exhausted its usefulness, and it has actually become a danger to our lives and our ability to survive on the planet.

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.

Years ago on the set of Gunsmoke I read the book The Holy Science. Since then I have not eaten meat.

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 should be able to support our own economy within our own borders.