On any given morning, you might wake up and shower with water, make your coffee with water, flush your toilet with water-and think nothing of it.

But around the world, more than three-quarters of a billion people can’t do any of that-because they have no clean water source near their homes. And 1.7 billion don’t have access to a toilet. This crisis affects a third of the people on the planet. It keeps kids out of school and women out of work. It traps people in extreme poverty. It spreads disease.

It’s also solvable. That conviction is what brought together movie actor Matt Damon and water expert and engineer Gary White. They spent years getting the answer wrong, then halfway right, then almost right. Over time, they and their organization, Water.org, have found an approach that works. Working with partners across East Africa, Latin America, South Asia, and Southeast Asia, they’ve helped over 40 million people access water and/or sanitation.

In The Worth of Water, Gary and Matt take us along on the journey-telling stories as they uncover insights, try out new ideas, and travel between the communities they serve and the halls of power where decisions get made. With humor and humility, they illuminate the challenges of launching a brand-new model with extremely high stakes: better health and greater prosperity for people allover the world.

The Worth of Water invites us to become a part of this effort-to match hope with resources, to empower families and communities, and to end the global water crisis for good. All the authors’ proceeds from the sale of this book will be donated to Water.org.