They're participants in Niger's School for Husbands. Ron Haviv/VII for NPR hide caption

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Ron Haviv/VII for NPR

School For Husbands Gets Men To Talk About Family Size

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Seun Dupe sits with her newborn twins in a maternity hospital in Lagos, Nigeria. Nigeria is Africa's most populous country with more than 160 million people. UNICEF estimates that number will swell to nearly 1 billion by 2100. Sunday Alamba/AP hide caption

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Sunday Alamba/AP

UNICEF Report: Africa's Population Could Hit 4 Billion By 2100

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London's financial district, known as the Square Mile. Will it be one of the first dominoes to fall when society can no longer sustain itself? Peter Macdiarmid/Getty Images hide caption

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Peter Macdiarmid/Getty Images

The crowded scene on "Black Friday" at Macy's in Manhattan. The U.S. population is projected to hit 400 million in 2051, Census says, up from 321 million in 2015. Stan Honda /AFP/Getty Images hide caption

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Stan Honda /AFP/Getty Images

Indian schoolchildren write English alphabets on slates at a primary school outside Hyderabad in June. India is on track to overtake China as the most populous nation in just 16 years. Noah Seelam/AFP/Getty Images hide caption

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Noah Seelam/AFP/Getty Images