Eric Chivian, M.D., is the Director of the Center for Health and the Global Environment at Harvard Medical School. He shared the 1985 Nobel Peace Prize. He is the lead editor and author of Last Aid: The Medical Dimensions of Nuclear War and Critical Condition: Human Health and the Environment. Aaron Bernstein, M.D., is a Research Associate at the Center for Health and the Global Environment at Harvard Medical School, and Resident, Boston Combined Residency in Pediatrics, Harvard Medical School/Boston University School of Medicine.