Unless we keep this planet healthy, everything else is for naught.

No one should be able to enter a wilderness by mechanical means.

The environment is everything that isn't me.

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

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

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.

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

People blame their environment. There is only one person to blame - and only one - themselves.

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