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Rapid population growth is about to hit the countries whose economies and climates are least equipped to handle it.

Wealthy countries have been trying to boost their birthrates for decades. The results have been pretty similar.

University of Nairobi scientists emerge the best in Kenya

The population explosion isn't over; its effects are rampant. But as the global birthrate eases, fewer people are speaking out.

In 2011, when the global population hit 7 billion, economist David Lam and demographer Stan Becker made a bet. Lam predicted food would get cheaper over the next decade, despite continuing population growth. Becker predicted that food prices would go up, because of the damage humans were doing to the planet, which meant that population growth would outstrip food supply. Becker won and, following his wishes, Lam has just written out a cheque for...