What would you do if you turned on the faucet one day and nothing happened? What if you learned the water in your home was harmful to drink? Water is essential for life on this planet, but not every community has the safe, clean water it needs. In When the World Runs Dry, award-winning science writer Nancy Castaldo takes readers from Flint, Michigan, and Newark, New Jersey, to Iran and Cape Town, South Africa, to explore the various ways in which water around the world is in danger, why we must act now, and why you're never too young to make a difference. Topics include: Lead and water infrastructure problems, pollution, fracking contamination, harmful algal blooms, water supply issues, rising sea levels, and potential solutions.

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Nancy F. Castaldo has been writing about the planet for over 20 years. She's contributed to the Sierra Club Waste Paper, NRDC's Personal Action column, and others. She is the author of many STEM books including, Sniffer Dogs: How Dogs (and Their Noses) Save the World, Back from The Brink: Saving Animals From Extinction, and Beastly Brains: Exploring How Animals Think, Talk, and Feel. She lives in New York's Hudson Valley. Visit her at nancycastaldo.com, on Twitter @NCastaldoAuthor, and on Instagram @naturespeak.