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3. Rifts, Cycles, and Recycles

The human body produces 500 liters of urine and 50 liters of faeces per year. This is equivalent to about half a kilogram of phosphorus. One day’s urine from an adult is sufficient to fertilize a square meter of cropped area for each cropping period.

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SK

Scott Knowles

Drexel University

Scott Knowles is associate professor in the Department of History at Drexel University. His work focuses on risk and disaster, with particular interests in modern cities, technology, and public policy. His most recent book is The Disaster Experts: Mastering Risk in Modern America (UPenn Press, 2011), and he is series co-editor of "Critical Studies in Risk and Disaster." Presently he is also a faculty research fellow of the Disaster Research Center at the University of Delaware.