The bus called as "bio-bus" is entirely powered by human wastes. It has started its service in United Kingdom. The Bio-Bus, which runs on gas generated through the treatment of sewage and food waste that’s unfit for human consumption, helps to improve urban air quality as it produces fewer emissions than traditional diesel engines. The human waste is collected from houses by the company and is converted to gas. With a full tank of gas, the bus can ran 300 kilometers.
The makers says that this is ecofriendly and helps to reduce the air pollution to a large extend.