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

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

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

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

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

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

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.

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

We don't have to sacrifice a strong economy for a healthy environment.