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

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

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.

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.

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

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

The environment is everything that isn't me.

Never doubt that a small group of thoughtful, committed citizens can change the world indeed, it's the only thing that ever has.