When I was a kid, we never heard of smog, ozone depletion, acid rain, green house gasses.

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.

There can be no lasting peace, no security, nor can we as human beings begin to touch our full potential, as long as hunger overwhelms the human spirit around this planet.

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

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.

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

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.