It appears that brown is the new green. The Denver Zoo has decided to make use of all that primo animal poop that comes out of its residents and convert it into fuel. Now you can tour the zoo (and enjoy a frozen margarita) with the aid of this poo-power.
Ever since Doc Brown added a Mr. Fusion to the Delorean, many of us have longed to fuel our car with banana peels and beer. Now you can, thanks to the magic of gasification.