With global warming on the rise and efforts to protect the environment increasing, an bus service has entered service in the U.K. that has a unique, environmentally-friendly trait: it's powered by human poop.
The "Bio-Bus", which runs between Bath and Bristol, uses methane-rich gas that is generated through the anaerobic digestion of sewage and food waste. Oxygen-starved bacteria break down biodegradable material and 'fart' out the subsequent methane gas.
On one tank, the 40-seater bus can travel up to 300km (186 miles) and guzzles the amount of waste about five people produce in a year.
Mohammed Saddiq, the general manager at GENeco, told the BBC: "Gas-powered vehicles have an important role to play in improving air quality in UK cities but the Bio-Bus goes further than that and is actually powered by people living in the local area, including quite possibly those on the bus itself."