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ENVIRONMENT-ARGENTINA/COWS
RTX7RN3 
July 09, 2008 
Cows stand in their pen at the National Institute of Agricultural Technology in Castelar, on the outskirts... 
Buenos Aires, Argentina 
Cows stand in their pen at the National Institute of Agricultural Technology in Castelar 
Cows stand in their pen at the National Institute of Agricultural Technology 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/Marcos Brindicci (ARGENTINA) 
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