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

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.

Local innovation and initiative can help us better understand how to protect our environment.

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

When we realize we can make a buck cleaning up the environment, it will be done!

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

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.

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.