In Barcelona, Certain Buses Run On Biomethane Produced From Human Waste
Odorless, quiet, sustainable. On the last day of July, passengers boarded Barcelona’s V3 bus line with no idea where its fuel came from. Written in large letters on the bus facade, just below its name “Nimbus,” a sign clearly stated: “This bus runs on biomethane produced from eco-factory sludge.” Still, Read more…






