The average person produces about four hundred pounds of excrement a year. More than seven billion people live on this planet. Holy crap! Because of the diseases it spreads, we have learned to distance ourselves from our waste, but the long line of engineering marvels we’ve created to do so—from Roman sewage systems and medieval latrines to the immense, computerized treatment plants we use today—has also done considerable damage to the earth’s ecology. Now scientists tell us: we’ve been wasting our waste. When recycled correctly, this resource, cheap and widely available, can be converted into a sustainable energy source, act as an organic fertilizer, provide effective medicinal therapy for antibiotic-resistant bacterial infection, and much more. In clear and engaging prose that draws on her extensive research and interviews, Lina Zeldovich documents the massive redistribution of nutrients and sanitation inequities across the globe. She profiles the pioneers of poop upcycling, from startups in African villages to innovators in American cities that convert sewage into fertilizer, biogas, crude oil, and even life-saving medicine. She breaks taboos surrounding sewage disposal and shows how hygienic waste repurposing can help battle climate change, reduce acid rain, and eliminate toxic algal blooms. Ultimately, she implores us to use our innate organic power for the greater good. Don’t just sit there and let it go to waste.

"A take on waste that's anything but wasteful—it's a fascinating dig into the history and science of handling human excrement. . . . Equally remarkable are Zeldovich's sections on the development and evolution of wastewater treatment plants. . . . Zeldovich is at home with an awkward subject, making for a grossly engrossing and vivid survey. Readers won't take the 'flush and forget' mindset for granted again." - Publishers Weekly

"Zeldovich is an engaging writer. She loves puns and poop jokes. (Who doesn't?) And her travels around the world are, in their own scatological way, inspiring." - New York Review of Books

"[An] original, necessary book." - Nature

"It would be easy for a book that focuses on obstacles to improving global sanitation, fixing the agricultural waste cycle, reducing pollution, and improving health to resort to paralyzing gloom. The Other Dark Matter does not shy from the enormity of the problems, yet suggests solutions are achievable, at scales from individuals to entire countries. Paced quickly with prose enlivened by the author's on-location reporting and personal experiences, the book is far from a grim slog through the world's sewers—it's more like an exciting tour in a biogas-powered balloon." - Undark

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"The Other Dark Matter does not shy from the enormity of the problems, yet suggests solutions are achievable, at scales from individuals to entire countries. Paced quickly with prose enlivened by the author's on-location reporting and personal experiences, the book is far from a grim slog through the world's sewers — it's more like an exciting tour in a biogas-powered balloon."

"It's unusual to come across a book that makes you say, 'Oh, crap!' in a good way." - American Scientist

"“In bright and airy prose, she takes readers on a globe-spanning trip to sites where fecal material is reprocessed and figuratively turned into gold. . . . Readers should leave this book with a renewed interest in sustainable systems to manage what we normally put out of sight and out of mind."" - Natural History

"“It is unquestionably [a topic] that—given the ever-increasing human population belaboring the planet—merits our attention if we are, ecologically and sustainably speaking, to prevent finding ourselves collectively up a famous creek without a propulsion device. Ms. Zeldovich’s new book looks to be an excellent way to introduce ourselves to it.”" - The Well-Read Naturalist

"Given the growing scale of public engagement in sanitation, there is a glut of books on the subject. Not all of them are readable, not all of them are well researched. This one is. It takes the technology questions further. It is an engaging read on a queasy topic" - Shaastra

"In writing a primer on poop and its possibilities, [Zeldovich] performs a much larger function: destigmatizing a vital biological product that has long gotten a bum rap." - Columbia Magazine

"Some of the ideas in [the book] really feel like they could change the world in a major way. . . . It's really excellent." - Across the Margin

"Even readers familiar with the history and ecology of waste management will not be disappointed. . . . As detailed as it is witty. . . . Given the growing scale of public engagement in sanitation, there is a glut of books on the subject. Not all of them are readable, not all of them are well researched. This one is. It takes the technology questions further. It is an engaging read on a queasy topic." - Shaastra

"Zeldovich provides a fascinating window into current attitudes towards waste and reflects on the wide-ranging meanings and practices associated with excreta. In doing so, she has written a book which picks up wider trends in present research: the porosity of the human body and its leakiness, the incomplete nature of transitions across explanatory frameworks of disease, and the rehabilitation of historic practices that might have transformative potential in the future." - British Journal for the History of Science