Composting Toilets May Help Save the World

A key discovery of nineteenth century science was that diseases can be transmitted via pathogens in human waste.  In regions of high population density, this can lead to epidemics if adequate sanitation facilities are not available. A milestone in epidemiology was the 1854 cholera outbreak in London. A physician named John Snow analyzed the incidence of the disease and concluded that the Broad Street public water pump was the source of infection. Even though he had no explanation in terms of germ theory at that time, he persuaded the authorities to remove the handle of that pump. This stopped the cholera epidemic. The well from which this pump drew had been dug a few feet away from an infected cesspool. A replica of this pump still stands in London:

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