Environment and Natural Resources

President Trump surprised almost everyone—probably not the least Kim Jong-un—when he agreed to meet the North Korean leader at the end of May (now maybe early June). By accepting Kim’s invitation, President Trump overturned decades of conventional wisdom on how to separate North Korea from its nuclear and other WMD programs. If Trump and Kim meet—as of now this is still a big “if,” although North Korea has now confirmed its willingness to meet directly—the summit could be an important ice breaker and open up a chance to resolve the North Korean nuclear crisis and bring peace to the Korean peninsula. But success, however remote it may seem, will require new thinking and entail major risks. It will also require a plan.

The escalating threats between North Korea and the United States make it easy to forget the “nuclear nightmare,” as former US Secretary of Defense William J. Perry put it, that could result even from the use of just a single terrorist nuclear bomb in the heart of a major city.

At the risk of repeating the vast literature on the tragedies of Hiroshima and Nagasaki—and the substantial literature surrounding nuclear tests and simulations since then—we attempt to spell out here the likely consequences of the explosion of a single terrorist nuclear bomb on a major city, and its subsequent ripple effects on the rest of the planet. Depending on where and when it was detonated, the blast, fire, initial radiation, and long-term radioactive fallout from such a bomb could leave the heart of a major city a smoldering radioactive ruin, killing tens or hundreds of thousands of people and wounding hundreds of thousands more. Vast areas would have to be evacuated and might be uninhabitable for years. Economic, political, and social aftershocks would ripple throughout the world. A single terrorist nuclear bomb would change history. The country attacked—and the world—would never be the same.