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In the capital of Ghana, a teenager nicknamed “Condom Sister” trolls the streets to educate other young people about contraception. Her work and her own aspirations point to a remarkable shift not only in the West African nation, where just a few decades ago women had nearly seven children on average, but around the globe. While world population continues to grow, family size keeps dropping in countries as diverse as Switzerland and South Africa.The phenomenon has some lamenting the imminent extinction of humanity, while others warn that our numbers will soon outgrow the planet’s resources. Robert Engelman offers a decidedly different vision—one that celebrates women’s widespread desire for smaller families. Mothers aren’t seeking more children, he argues, but more for their children. If they’re able to realize their intentions, we just might suffer less climate change, hunger, and disease, not to mention sky-high housing costs and infuriating traffic jams.