Coming Population Crash

The Reproductive Revolution: How Women Are Changing the Planet's Future: Scientific American

But more than 60 countries—containing approaching half of the world's population—already have fertility rates at or below the rate needed to maintain their populations long-term. The club now includes most of the Caribbean islands, Japan, South Korea, China, Thailand, Sri Lanka, Iran, Turkey, Vietnam, Brazil, Algeria, Kazakhstan and Tunisia. Within 20 years, demographic giants like Indonesia, Bangladesh, Mexico and India will in all probability also have below-replacement fertility.