The apocalypse has become big business. And it’s getting bigger every day. In the ’50s, homeowners fearing Communist attacks built bunkers in their backyards and basements, hung up a few “God Bless Our Bomb Shelter” signs and called it a Cold War. But today, Americans en masse are again preparing for the worst—and Communists are just about the only thing not on their list. What is? Terrorist attacks, a total economic collapse, perhaps even zombie invasions. Or maybe just a complete societal breakdown after this November’s scorched-Earth presidential election. But this is not your Uncle Travis’ guns-and-canned-foods-militia vision of Armageddon...