A red London double-decker bus passes the London Eye as it is driven over Westminster Bridge in central London on November 20, 2017. London's caffeine habit could soon provide an eco-friendly energy kick to its buses, including its iconic red double decker. Some six thousand litres of oil extracted from ground coffee waste was added to fuel tanks of the city's transport authority on Monday -- enough to power a bus for a whole year.(Photo/Agencies)
