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

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

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

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

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

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

The only way forward, if we are going to improve the quality of the environment, is to get everybody involved.

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

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.