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

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.

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

Moreover, the practical recommendations deduced from ecological principles threaten the vested interests of commerce; it is hardly surprising that the financial and political power created by these investments should be used sometimes to suppress environmental impact studies.

Incommensurables cannot be compared.

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

The exquisite sight, sound, and smell of wilderness is many times more powerful if it is earned through physical achievement, if it comes at the end of a long and fatiguing trip for which vigorous good health is necessary. Practically speaking, this means that no one should be able to enter a wilderness by mechanical means.