The only thing we can really count on in this uncertain world is human unreliability itself.

But as population became denser, the natural chemical and biological recycling processes became overloaded, calling for a redefinition of property rights.

Of course, a positive growth rate might be taken as evidence that a population is below its optimum.

No one should be able to enter a wilderness by mechanical means.

The three filters [against folly] operate through these particular questions: Literacy: What are the words? Numeracy: What are the numbers? Ecolacy: And then what?

There is nothing more dangerous than a shallow thinking compassionate person

But it is no good using the tongs of reason to pull the Fundamentalists' chestnuts out of the fire of contradiction. Their real troubles lie elsewhere.