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.

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

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.

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.

In a finite world this means that the per capita share of the world's goods must steadily decrease.

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

Never globalize a problem if it can possibly be dealt with locally.