Political causes have always had radical fringe elements. It may be hard for many to understand those who are willing to risk their lives in defense of the planet, but this book is excellent in explaining who they are and what motivates them. Scarce gives the historical background of the radical environmental movement, reviews several groups with examples of their activities, and discusses the future of the movement. Although the intensity and extremist tactics of the ``eco-warriors'' may be off-putting, Scarce suggests that in the end we may owe thanks for our very survival to these people. A real bargain at the price, this book is a welcome addition to general and environmental collections that might also include Bill McKibben's The End of Nature ( LJ 10/1/89), a warning against the destruction of nature, and Christopher Manes's Green Rage: Radical Environmentalism and the Unmaking of Civilization ( LJ 5/1/90), a personal view of the radical movement.-- Kathleen L. Atwood, Pomfret Sch. Lib., Ct.