A century-old Milwaukee process transforms human waste into a bestselling lawn fertiliser, turning a disposal problem into a circular economy. This has saved over 10 billion pounds of waste from going to a landfill and being packaged into bags of lawn fertiliser. The waste that the city flushes away is sold to people who want a greener and healthier yard. The acting agent in the middle is a colony of microbes that ate the waste and then died.
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