This map should worry everyone The replacement fertility rate is roughly 2.1 births per woman, the level needed for a population to replace itself over generations Most of the developed world is now way below that line • US: around 1.5–1.6 births per woman • UK: around 1.5–1.6 • France: around 1.5–1.6 • China: around 1.0 • South Korea: around 0.8 Meanwhile, countries like Chad and Somalia are still around 5.9 births per woman This is one of the biggest demographic divides on Earth The richest, most industrialized, most technologically advanced countries are no longer having enough children to sustain their populations naturally That means aging societies, shrinking workforces, fewer young people, more pressure on pensions, healthcare, housing, taxation, and national productivity