A finite world can support only a finite population; therefore, population growth must eventually equal zero.

In a competitive world of limited resources, total freedom of individual action is intolerable

In an approximate way, the logic of commons has been understood for a long time, perhaps since the discovery of agriculture or the invention of private property in real estate.

A technical solution may be defined as one that requires a change only in the techniques of the natural sciences, demanding little or nothing in the way of change in human values or ideas of morality.

To say that we mutually agree to coercion is not to say that we are required to enjoy it, or even to pretend we enjoy it.

It takes five years for a willing person's mind to change. Have patience with yourself and others when treading in an area protected by a taboo.

Indeed, our particular concept of private property, which deters us from exhausting the positive resources of the earth, favors pollution.