A crappy bus ride.

• Position: ENVIRONMENT - Bus uses human poop as fuel - Brief article

Most vehicles run on gasoline or diesel. But one bus in England depends on a very different kind of fuel: human poop. The Bio-Bus, dubbed the "poo bus," recently hit the road, taking passengers between Bristol and Bath. Its tank is filled with biomethane gas, a renewable fuel made from the treatment of human waste and food scraps. When burned, biomethane gas emits 30 percent less carbon dioxide than diesel, and it's already fueling buses in Norway, Sweden, and Germany to improve...