Super Grass Could Reduce Cows’ Methane-Heavy Burps

A genetically modified grass could help minimize cow belches, which contain a potent greenhouse gas.

For years, scientists have been looking for a safe, effective way to keep cows from belching. And it’s not because they’re concerned about their manners.

Those burps are a significant source of methane, a greenhouse gas that’s many times more potent than carbon dioxide. A 1995 study found that each cow produces between 250 and 500 liters of the gas. A tiny amount of that is released through flatulence, but most of it is emitted from their mouths.

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