Washington, D.C., October 30, 2024 - A 1983 study from scientists at the Department of Energy’s Lawrence Livermore Laboratory said that a full-scale nuclear war between the superpowers would “dramatically affect the atmosphere’s temperature, dynamic, precipitation, and chemistry,” reduce “the light reaching the surface in the Northern Hemisphere by 90% or more,” and could cause “a cooling of continental land areas by up to 30°C.”