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

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

We learned that economic growth and environmental protection can and should go hand in hand.

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.

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

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

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.

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