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By the late 1800s, large cities all around the world were “drowning in horse manure”.
The main concern was the large amount of manure left behind on the streets. On average a horse will produce between 6 and 14 kg of manure per day, so you can imagine the sheer scale of the problem. The manure on London’s streets also attracted huge numbers of flies which then spread typhoid fever and other diseases.

This became known as the ‘Great Horse Manure Crisis of 1894’.
Interesting Links:
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Saving Bangalore, one lake at a time ~ Anand Malligavad at TEDx IIT Bangalore