It is a mistake to think that we can control the breeding of mankind in the long run by an appeal to conscience.

The morality of an act is a function of the state of the system at the time it is performed.

We can't cure a shortage by increasing the supply.

Continuity is at the heart of conservatism: ecology serves that heart.

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.

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

Incommensurables cannot be compared.