Experts have long known that population density is a major factor in evaluating a person’s risk for falling victim to crime, disease, and man made disasters, but it is also the leading indicator of zombie survivability. Overpopulated city don’t just cause problems for urban planners, power suppliers and pollution regulators, they create a citizenship that is shockingly unable to take care of itself in a crisis.
Before the year 2,000 there were only three urban areas in the world with a population over 10 million: Mexico City, New York, and Tokyo. Today at least 13 additional cities have reached that size, and in the next five years or so the number of mega-cities worldwide is expected to double. Add to that another 381 metro areas with a population greater than 1 million, and it’s easy to see that the global community is crowding dangerously together.
Despite the traditional cinematic depiction of zombies attacking a small group of survivors in a remote farmhouse, the real danger of a fast-spreading undead sickness lies in big cities. So as the trend towards urbanization continues, the world becomes less and less likely to survive the coming zombie plague.