Beyond the global warming studies, I wonder if we might be looking at a future energy source here. Forget the ethanol fuels and the hydrogen batteries, I want a car that runs on cow burps!

Marcos Brindicci/Reuters
Argentine scientists are taking a novel approach to studying global warming, strapping plastic tanks to the backs of cows to collect their burps. Researchers say the slow digestive system of cows makes them a producer of methane, a potent greenhouse gas that gets far less public attention than carbon dioxide in efforts to fight global warming.