Paul R. Ehrlich is cofounder of the field of coevolution and a pioneer in alerting the public to the problems of overpopulation, depletion of natural resources, and deterioration of the environmental systems that support humanity. His previous books include Humanity on a Tightrope: Thoughts on Empathy, Family, and Big Changes for a Viable Future, The Dominant Animal: Human Evolution and the Environment, Human Natures: Genes, Cultures, and the Human Prospect, and the bestselling The Population Bomb. He lives in Palo Alto, CA.