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

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

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.

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

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

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

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

When we try to pick out anything by itself, we find it hitched to everything else in the universe.

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