What zombies are to the 2010s, nuclear war was to the 1980s. The Cold War against the forces of Communism resulted in both sides building up arsenals of doomsday bombs that could destroy the Earth a dozen times over. The modern threat of nuclear war is a little different. With rogue players like Iran and North Korea working to develop atomic bombs, all it will take is two nations escalating to kick off the apocalypse. As few as 100 bombs detonated in a short period of time could cue “nuclear winter,” a massive climatic effect that would bring Earth temperatures down to their lowest point in thousands of years. This would devastate food production, causing widespread famine and death.