Count Down

How Our Modern World Is Threatening Sperm Counts, Altering Male and Female Reproductive Development, and Imperiling the Future of the Human Race

By Shanna Swan, PhD, with Stacey Colino

In the tradition of Silent Spring and The Sixth Extinction, an urgent, meticulously researched, and groundbreaking book about the ways in which chemicals in the modern environment are changing human sexuality and endangering fertility on a vast scale.

In 2017, Shanna Swan and her team of researchers completed a major study. They found that over the previous four decades, sperm levels among men in Western countries had plummeted by more than 50 percent. The results sent shockwaves around the globe—but that was just the beginning. It turns out that sexual development is also changing broadly, for both men and women, and that the modern world is on pace to become an infertile one.

How and why could this happen? What is hijacking our fertility and our health? Count Down reveals what Swan and other researchers have learned about how chemical exposures are affecting our fertility, sexual development—even, perhaps, gender identity—and general health. Not just an illuminating overview of a grave threat but a helpful guide to protecting against it, Count Down is an urgent wake-up call, an enjoyable read, and a vital tool for understanding our future.

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