Just as people plagued by flatulence have turned to diets and supplements for relief, scientists are seeking a cure for belching — and sometimes farting — cows.
The stakes are far higher with cows than with humans passing gas in public, though. Cows and other types of ruminants emit methane as their digestive systems break down the grasses or other foods they consume. Add up all the cows in the United States, or those in nations like India or China, which are consuming greater amounts of meat, and you have a significant contributor to global warming.Though methane breaks down more quickly than carbon dioxide, it's more efficient at trapping heat in the atmosphere than CO2. That means that pound for pound, according to the US Environmental Protection Agency, methane is 84 times more potent of a greenhouse gas than carbon dioxide over a 20-year period.

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