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Last November, the United Kingdom launched service in southwestern England on the eco-friendly Bio-Bus, which runs exclusively on biomethane that is produced from human waste products treated through a process called anaerobic digestion.

Affectionately dubbed the ‘poo-bus,’ the 40-seater can travel 180 miles on a single tank of gas and emits 20 percent to 30 percent less carbon dioxide than a standard diesel bus, reducing the amount of harmful exhaust gases that contribute to air pollution.

The bus is completely powered by treated sewage and food waste. The annual wastewater and food waste produced by five people produces enough biomethane for the roundtrip journey. The first route has been so successful that a second route, aptly named the “No. 2 Bus,” was added.