The environment is everything that isn't me.

There's an old saying which goes: Once the last tree is cut and the last river poisoned, you will find you cannot eat your money.

When the Pleiades and the wind in the grass are no longer a part of the human spirit, a part of very flesh and bone, man becomes, as it were, a kind of cosmic outlaw, having neither the completeness and integrity of the animal nor the birthright of a true humanity.

The environment does not determine man's culture; it merely sets the outer limits and at the same time offers opportunities.

We are all passengers aboard one ship, the Earth, and we must not allow it to be wrecked. There will be no second Noah's Ark.

In remaking the world in the likeness of a steam-heated, air-conditioned metropolis of apartment buildings we have violated one of our essential attributes-our kinship with nature.

A grateful environment is a substitute for happiness. It can quicken us from without as a fixed hope and affection, or the consciousness of a right life, can quicken us from within.

Overcrowding can be corrected only by inducing people not to crowd, and the environment will continue to deteriorate until polluting practices are abandoned.

Man is messy, but any creature that can create space vehicles can probably cope.

Earth is a family business.