Imagine stopping at a gas station and filling your car with poop! Fuel made from poop may sound like science fiction, but it exists in many parts of the world--and has for a long time. This engrossingly gross guide explores the powerful possibilities of poop. Readers discover how scientists are learning to make renewable fuels from feces. Unlike fossil fuels, poop is cheap, it's plentiful, and it's everywhere we are. This makes it a strong contender for one of the fuel sources of the future. Readers get the inside scoop on this use for poop with the help of accessible text and colorful photographs.