I have a private plane. But I fly commercial when I go to environmental conferences.

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

The environment is everything that isn't me.

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

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

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

The only way forward, if we are going to improve the quality of the environment, is to get everybody involved.

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

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.