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.

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

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

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

Local innovation and initiative can help us better understand how to protect our environment.

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

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

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

Unless we keep this planet healthy, everything else is for naught.