The rational man finds that his share of the cost of the wastes he discharges into the commons is less than the cost of purifying his wastes before releasing them.

Economists (and others) who are satisfied with nature-free equations develop a dangerous hubris about the potency of our species

You cannot do only one thing.

The greatest folly is to accept expert statements uncritically. At the very least, we should always seek another opinion.

Ecology is the overall science of which economics is a minor speciality.

People are the quintessential element in all technology... Once we recognize the inescapable human nexus of all technology our attitude toward the reliability problem is fundamentally changed.

(Technology reliability) x (Human reliability) = (System reliability)