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

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

The environment is everything that isn't me.

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

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

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

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

Take a course in good water and air and in the eternal youth of Nature you may renew your own. Go quietly, alone no harm will befall you.

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

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