By polluting clear water with slime you will never find good drinking water.

Keep close to Nature's heart... and break clear away, once in awhile, and climb a mountain or spend a week in the woods. Wash your spirit clean.

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

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

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

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.

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

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

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

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