How is our fate linked to the earth's creatures, and the cycle of flourishing and extinction? Does human activity accelerate extinction? And what really causes it? This account of the widespread reduction of the world's wildlife examines humankind's role in the larger life cycles of the earth, composing a provocative general theory of extinction. "A powerfully impassioned plea for awareness--awareness of what we are doing, of what the consequences will be, and of what we can still do to reduce the biotic holocaust ahead."