Never doubt that a small group of thoughtful, committed citizens can change the world indeed, it's the only thing that ever has.

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.

The environment is everything that isn't me.

Harmony with land is like harmony with a friend you cannot cherish his right hand and chop off his left.

We don't have to sacrifice a strong economy for a healthy environment.

Not all is doom and gloom. We are beginning to understand the natural world and are gaining a reverence for life - all life.

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.

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

If we do not permit the earth to produce beauty and joy, it will in the end not produce food, either.