http://www.slate.com/id/2178776/?GT1=10733

Hold the Fart

Fighting global warming through animal burps.

By William Saletan Updated Thursday, Dec. 6, 2007, at 9:16 AM ET

Scientists are trying to fight global warming by changing animal flatulence. Emissions from livestock reportedly account for up to half of greenhouse gas emissions in some countries. Kangaroos have stomach bacteria that eliminate methane from their gas; scientists want to transfer these bacteria to sheep and cattle. Bonus: The bacteria could improve digestive efficiency by 10 to 15 percent, thereby reducing feed costs. Alternative proposal: Eat less cattle and more kangaroo meat: "It's low in fat, it's got high protein levels," and "it's the ultimate free range animal."