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

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

By polluting clear water with slime you will never find good drinking water.

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.

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

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

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.

When we realize we can make a buck cleaning up the environment, it will be done!