Take a course in good water and air and in the eternal youth of Nature you may renew your own. Go quietly, alone no harm will befall you.

I have a private plane. But I fly commercial when I go to environmental conferences.

When we try to pick out anything by itself, we find it hitched to everything else in the universe.

Much of the debate over global warming is predicated on fear, rather than science.

It seems that every time mankind is given a lot of energy, we go out and wreck something with it.

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

Keep close to Nature's heart... and break clear away, once in awhile, and climb a mountain or spend a week in the woods. Wash your spirit clean.

Our world faces a true planetary emergency. I know the phrase sounds shrill, and I know it's a challenge to the moral imagination.

I can find God in nature, in animals, in birds and the environment.

I did not become a vegetarian for my health, I did it for the health of the chickens.