The massive quantities of radiation that would be released in a war fought with nuclear weapons might, over time, cause such great changes in the human gene pool that following generations might not be recognizable as human beings.

On one hand, I'm an optimistic pessimist. On the other, I'm a pessimistic optimist. But while there's life, there's still hope, and I wouldn't be doing what I'm doing if I didn't think there was still hope.

If the corporations have their way, the Earth will be killed, and that's in your lifetime. It's revolting to me that students are being trained to work in corporations. It's obscene to me that the corporations are running the world. We've got to get cross. Anger is an appropriate emotion.

I have witnessed the takeover of my world by plastic.

Cuba is a wonderful country. What Castro’s done is superb.

Every time you turn on an electric light, you are making another brainless baby.

as a physician I examine the dying planet as I do a dying patient. The earth has a natural system of interacting homeostatic mechanisms similar to the human body's. If one system is diseased, like the ozone layer, then other systems develop abnormalities in function - the crops will die, the plankton will be damaged, and the eyes of all creatures on the planet will become diseased and vision impaired.