There are factors that effect it such as living conditions, health, etc., but the average cow expels approximately 70 to 120 kg of methane a year. When you look at how many cattle are raised around the world, that’s a lot of methane!
On it’s own, a cow produces about 80-110 kgs of methane in a year, with the cows raised for beef producing the most. However, according to the Environmental Protection Agency, there are about 100 million cattle in the U.S. alone. That means that in one year, cows alone emit about 5.5 million metric tons of methane gas and that they contribute about 1/5 of our U.S. methane emissions. In addition to methane, they can emit other gases such as nitrous oxide. This problem is due mainly to the huge amounts of cows and other livestock raised throughout the world, but improved “productivity and efficiency” of practices have been identified as ways to reduce the greenhouse gas emissions in the future.
There are ways of capturing the methane from cow manure, but the real problem is when cows burp. On a given day, a cow will burp out 280 liters of methane, all of which contributes to global warming. In a year, that amounts to 102,200 liters of methane for a single cow.
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