The state of the art and the fate of the earth.

A recent review by Nevin of Jonathan Schell's The Fate of the Earth applies a "behavioral perspective" to the problem of species survival in a nuclear age. It is suggested that no perspective, in this context as in others where less is at stake, should dismiss prematurely some useful ideas from other perspectives. A sampling of "cognitive" concepts is offered to illustrate what actions, aimed at resisting species extinction, might follow from them-not instead of, but in addition to, the guidelines for action a behavioral perspective provides.