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

The environment is everything that isn't me.

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.

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

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

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

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.

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

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