By 2025, there will be 27 megacities around the world, each with populations exceeding 10 million.

What’s the “real population bomb”? Not the number of people but the places that growth will mostly happen: northern Africa, the Middle East, South Asia, China, and Indonesia, where poverty is already severe and preparedness for the growth is low. Source: Book review by WFS of defense experts P. H. Liotta and James F. Miskel book, The Real Population Bomb