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

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

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.

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

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

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

We learned that economic growth and environmental protection can and should go hand in hand.

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

I think the cost of energy will come down when we make this transition to renewable energy.

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