Story: Atmosphere
Methane is one of the three most important gases that cause the earth’s lower atmosphere to warm. It is produced by cud-chewing animals, such as cows and sheep, as part of their normal digestive process. The average New Zealand dairy cow produces 90 kilograms of methane per year, mainly by burping.
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GNS Science
Reference: CN45566/11
Photograph by Lloyd Homer
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