If we do not permit the earth to produce beauty and joy, it will in the end not produce food, either.

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

When we try to pick out anything by itself, we find it hitched to everything else in the universe.

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.

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

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.

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

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

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