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

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

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

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

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

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

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

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

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

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