More than 5 billion people would die of hunger following a full-scale nuclear war between the U.S. and Russia. Under this largest war scenario, more than 75% of the planet would be starving within two years.
Even a localized India-Pakistan war would also reverberate worldwide, resulting in possibly two billion deaths from lack of food.
"The data tell us one thing: We must prevent a nuclear war from ever happening," said Alan Robock, a Distinguished Professor of climate science in the Department of Environmental Sciences at Rutgers University and co-author of the study. "If nuclear weapons exist, they can be used, and the world has come close to nuclear war several times."