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

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

Not all is doom and gloom. We are beginning to understand the natural world and are gaining a reverence for life - all life.

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

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

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

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.

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

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

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