(www.treehugger.com) Pictured here: Urine-powered batteries are already on the shelves in AA and AAA sizes in Japan. Gerardine Botte of Ohio University uses an electrolytic approach to produce hydrogen from urine - the most abundant waste on Earth - at a fraction of the cost of producing hydrogen from water.
Forget Gas, Batteries — Pee is New Power Source
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JULY 08, 2009
PhysOrg

You do two things at motorway services: fill up one tank and empty another. US chemists have combined refuelling your car and relieving yourself by creating a new catalyst that can extract hydrogen from urine.
Chemistry World reports that the catalyst could not only fuel the hydrogen-powered cars of the future, but could also help clean up municipal wastewater.
Read the full story: http://www.physorg.com/news165836803.html
More coverage on MSNBC: http://www.msnbc.msn.com/id/31805166/ns/technology_and_science-innovation/