Four Billion More What to Do About Massive Population Growth

The populations in the poorest countries on earth are doubling every few decades. That necessarily leads to conflict over scarce resources such as land, food and work -- and to more migration to Europe. But there are solutions.
A crowded market square in central Lagos.

A crowded market square in central Lagos.

Akintunde Akinleye / REUTERS
Graphic: Projected population growth in select countries.

Graphic: Projected population growth in select countries.

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