We see the stories in the newspaper nearly every day: a drug hailed as a breakthrough treatment turns out to cause harmful side effects; controls implemented to reduce air pollution are shown to generate hazardous solid waste; bans on dangerous chemicals result in the introduction of even more risky substitutes. Could our efforts to protect our health and the environment actually be making things worse? In "Risk versus Risk," John D. Graham, Jonathan Baert Wiener, and their colleagues at the Harvard Center for Risk Analysis marshal an impressive set of case studies which demonstrate that all too often our nation's campaign to reduce risks to our health and the environment is at war with itself.