The threat, we are told here this weekend, is existential, biological, epoch-defining. Economies will fail, civilizations will fall, and it will all happen because people aren’t having enough babies.

“The entire global financial system, the value of your money, and every asset you might buy with money is defined by leverage, which means its value depends on growth,” Kevin Dolan, a 37-year-old father of six from Virginia, tells the crowd that has gathered to hear him speak. “Every country in the developed world and most countries in the developing world face long-term population decline at a level that makes growth impossible to maintain,” Dolan says, “which means we are sitting on the bubble of all bubbles.”