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

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

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

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

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

The environment is everything that isn't me.

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

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

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

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