If an economy is to sustain progress, it must satisfy the basic principles of ecology. If it does not, it will decline and eventually collapse. There is no middle ground

One way or another, the choice will be made by our generation, but it will affect life on earth for all generations to come

Saving civilization is not a spectator sport.

No civilization has survived the ongoing destruction of its natural support systems. Nor will ours.

Today, more than ever, we need political leaders who can see the big picture, who understand the relationship between the economy and its environmental support systems.

Our numbers expand, but Earth's natural systems do not.

The foundation is being laid for the emergence of both wind and solar cells as cornerstones of the new energy economy.

The throwaway economy that has been evolving over the last half-century is an aberration, now itself headed for the junk heap of history.

Population growth is exceeding farmers' ability to keep up...Our oldest enemy, hunger, is again at the door.

Humanity's greatest challenge may soon be just making it to the next harvest.

Socialism failed because it couldn't tell the economic truth. Capitalism may fail because it couldn't tell the ecological truth.

To produce a mighty book, you must choose a mighty theme.

A woman, especially if she have the misfortune of knowing anything, should conceal it as well as she can.

There is no justification for present existence other than its expansion into an indefinitely open future.

We have no words for speaking of wisdom to the stupid. He who understands the wise is wise already.

I am tired of myself in every way. All things, deep down to the secret of their roots, are stained by the color of my weariness.

Haters are cowards. When confronted they often back down. We must resist haters.

One half of the world's people live on less than two dollars a day. This should concern our national security policy as well as our conscience.

The needs of the many outweigh the needs of the few.

If you want to be a stand-up comedian or an artist, you move to New York.

Climbing is not a battle with the elements, nor against the law of gravity. It's a battle against oneself.