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

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

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

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

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

Birds are indicators of the environment. If they are in trouble, we know we'll soon be in trouble.

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

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

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

We won't have a society if we destroy the environment.