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

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

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

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

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

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

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

I firmly believe that we can have a healthy environment and a sustainable timber industry.

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

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