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What finally solved the Victorian 'great horse manure crisis' that urban planners considered intractable?

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The Great Horse Manure Crisis of 1894, When Cities Calculated They Would Drown in Dung

By the 1890s London and New York ran on tens of thousands of horses, each producing over 10 kilograms of manure a day. Urban commentators projected streets buried metres deep within decades; the 1898 international urban planning conference reportedly broke up with no solution. The automobile made the entire problem vanish — a favourite parable with a catch: its most famous quotation cannot be traced.

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