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The Risk & Benefits Of Using Human Poop As Fertilizer
San Francisco startup turns human poop into fertilizer - Popular Science
Night soil - Wikipedia
Is It Safe To Use Compost Made From Treated Human Waste?
A History of Human Waste as Fertilizer - JSTOR Daily
Farming: Why are farmers using human poo fertiliser?
The long, noble and stinky quest to make human shit useful
Human Feces and Urine Safe to Use as Fertilizers, Europe …
Human feces - Wikipedia
Human waste treatment helps solve climate change puzzle