Urine-powered cars could be available in six months with new technology developed by scientists from Ohio University.
Using a nickel-based electrode, the scientists claim they can create cheap hydrogen from urine that could be used in fuel cells to power cars, houses and other appliances.
Urine is rich in hydrogen, and extracting the chemical from urine requires only a quarter of the energy needed to extract it from water.
"One cow can provide enough energy to supply hot water for 19 houses," said Gerardine Botte, a professor at Ohio University developing the technology.
A urine-powered fuel cell vehicle could theoretically achieve 90 miles per gallon, according to the scientists behind the reasearch.
"It is not a solution for all our cars," said John Stickney, a chemist and professor at the University of Georgia, "but it is the kind of process which will find many applications and will make for a greener world."