"In 1979, the National Population and Family Planning Commission in China enacted an ambitious program that called for strict population control. Families in various urban districts are urged to have only one child—preferably a son—in order to solve the problems related to overpopulation. What has happened since then and what are its implications for the future of China?" This is an excellent infographic for understanding population dynamics in the world's most populous country.
Via Seth Dixon, Matthew Wahl