Catastrophic risks are much greater than is commonly appreciated. Collision with an asteroid, runaway global warming, voraciously replicating nanomachines, a pandemic of gene-spliced smallpox launched by bioterrorists, and a world-ending accident in a high-energy particle accelerator, are among the possible extinction events that are sufficiently likely to warrant careful study. How should we respond to events that, for a variety of psychological and cultural reasons, we find it hard to wrap our minds around? Posner argues that realism about science and scientists, innovative applications of cost-benefit analysis, a scientifically literate legal profession, unprecedented international cooperation, and a pragmatic attitude toward civil liberties are among the keys to coping effectively with the catastrophic risks.

Richard A. Posner is Judge of the U.S. Court Appeals for the Seventh Circuit, and a senior lecturer at the University of Chicago Law School. He is the author of numerous books, including Overcoming Law a New York Times Book Review editors' choices for best book of 1995 and An Affair of State, one of their choices for Best Book of the Year in 1999.