Africa's population could nearly triple this century while Europe shrinks.

Population of Africa and Europe, 1950 to 2100, UN medium projection. Billions. Africa heads toward roughly 3.9 billion as Europe falls below 0.6 billion.
- Africa is young and its fertility, though falling, is still well above replacement, so its population keeps compounding for decades.
- Europe has been below replacement for years; without immigration its numbers slide as deaths outpace births.
- The result is a vast and widening gap: by 2100 Africa could hold more than six people for every European.
The world's future workers, consumers and migrants will be overwhelmingly African. Demographics are quietly redrawing the map of economic power, and the centre of human gravity is moving south.