Historically, people have used urban agriculture for more than just supplying food. Excrement and wastewater may be bad for human health, but they can be excellent for fertilizing crops.  In nineteenth-century Paris, gardeners found an excellent way to turn unwanted horse manure from all over the city into valuable salad greens that were available year-round.  Every year they turned over one million tons of stable horse manure (the city’s transportation service) into 100,000 tons of out-of-season salad, harvested 3 to 6 times a year.  So much  salad was produced that every person in paris could have eaten 50kg per year.  The production was biggest in the last third of the 1800’s.  Today there is a Marais district, but that is all that is left of the humongous market gardens covering a sixth of the city.(UN Urban Ag book)

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