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

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

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

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

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

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

The environment is everything that isn't me.

I think the cost of energy will come down when we make this transition to renewable energy.

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

I can find God in nature, in animals, in birds and the environment.