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.

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

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

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

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

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.

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

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.