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

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

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

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

I did not become a vegetarian for my health, I did it for the health of the chickens.

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.

The environment is everything that isn't me.

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

Not all is doom and gloom. We are beginning to understand the natural world and are gaining a reverence for life - all life.