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

We learned that economic growth and environmental protection can and should go hand in hand.

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

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

By polluting clear water with slime you will never find good drinking water.

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

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

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

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

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