There, microorganisms break down the waste to methane, which becomes a source of energy for the building, powering a gas stove, hot-water boiler and solid oxide fuel cell.“ If we think out of the box, feces has precious value to make energy and manure.... I have put this value into ecological circulation, ” Cho said.An average person defecates about 500g a day, which can be converted to 50 litres of methane gas, the environmental engineer said.... Each person using the eco-friendly toilet earn