If I were reincarnated, I would wish to be returned to Earth as a killer virus to lower human population levels. —Prince Phillip, World Wildlife Fund

We have wished, we ecofreaks, for a disaster or for a social change to come and bomb us into Stone Age, where we might live like Indians in our valley, with our localism, our appropriate technology, our gardens, our homemade religion—guilt-free at last! —Stewart Brand (writing in the Whole Earth Catalogue).

The right to have children should be a marketable commodity, bought and traded by individuals but absolutely limited by the state. Kenneth Boulding, originator of the “Spaceship Earth” concept (as quoted by William Tucker in Progress and Privilege, 1982)