Mental degeneracy may be caused by lead poisoning. Or by a poor dip in the gene pool.

A world without open country would be universal jail.

I come more and more to the conclusion that wilderness, in America or anywhere else, is the only thing left that is worth saving.

We live in a society in which it is normal to be sick; and sick to be abnormal.

I would not sacrifice a single living mesquite tree for any book ever written. One square mile of living desert is worth a hundred 'great books' - and one brave deed is worth a thousand.

Motherhood is an essential, difficult, and full-time job. Women who do not wish to be mothers should not have babies.

I thought of the wilderness we had left behind us, open to sea and sky, joyous in its plenitude and simplicity, perfect yet vulnerable, unaware of what is coming, defended by nothing, guarded by no one.