Guillermo Berra, a researcher at the National Institute of Agricultural Technology, adjusts a plastic tank on the back of a cow at their farm in Castelar, on the outskirts of Buenos Aires, in this picture taken July 4, 2008. 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. Picture taken July 4, 2008. Reuters Pictures logo Reuters Pictures 43 months ago

Guillermo Berra, a researcher at the National Institute of Agricultural Technology, adjusts a plastic tank on the back of a cow at their farm in Castelar, on the outskirts of Buenos Aires, in this picture taken July 4, 2008. 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. Picture taken July 4, 2008.

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