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

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

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

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

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

Birds are indicators of the environment. If they are in trouble, we know we'll soon be in trouble.

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

I did not become a vegetarian for my health, I did it for the health of the chickens.

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