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

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

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

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

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

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

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

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

We don't have to sacrifice a strong economy for a healthy environment.

The environment is everything that isn't me.