A horse produces ~20 pounds of manure and a liter of piss per day. It was not possible to keep the streets clean. Removing that waste was itself a huge logistic

A horse produces ~20 pounds of manure and a liter of piss per day. It was not possible to keep the streets clean. Removing that waste was itself a huge logistical problem. > At the turn of the 20th century, the most malodorous environmental challenge facing the world’s big cities was not slums, sewage or soot; it was horse dung. In London in 1900, an estimated 300,000 horses pulled cabs and omnibuses, as well as carts, drays and haywains, leaving a swamp of manure in their wake. The citizens of New York, which was home to 100,000 horses, suffered the same blight; they had to navigate rivers of muck when it rained, and fly-infested dungheaps when the sun shone. At the first international urban-planning conference, held in New York in 1898, manure was at the top of the agenda. No remedies could be found, and the disappointed delegates returned home a week early. (https://www.economist.com/special-report/2016/11/26/the-future-of-oil https://www.economist.com/special-report/2016/11/26/the-futu...) See also The Horse & the Urban Environment: https://enviroliteracy.org/environment-society/transportation/the-horse-the-urban-environment/ https://enviroliteracy.org/environment-society/transportatio...