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The Safavid people of Persia use dried animal dung as fuel.
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Assyrians use dung as fuel to heat their bathwater
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Jan Baptist van Helmont works out that flammable gases can arise from feces
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1859 The first anaerobic digestion plant is built in Bombay, India, to provide energy for a leper colony.
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1860s European settlers of the Great Plains, lacking wood and coal, use buffalo manure to provide fuel for heat and cooking.
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2014 The world’s first “poo bus,” fueled by human waste, goes into service in Bristol, England
