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.

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

I firmly believe that we can have a healthy environment and a sustainable timber industry.

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

You may be able to fool the voters, but not the atmosphere.

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.

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

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.