Individual cows can produce up to 500 liters of methane a day; the species accounts for about one-third of total methane emissions. The structures shown represent the structure of methane. Photo: Danielle Gruen (edited by Jose-Luis Olivares/MIT)

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Individual cows can produce up to 500 liters of methane a day; the species accounts for about one-third of total methane emissions. The structures shown represent the structure of methane. Photo: Danielle Gruen (edited by Jose-Luis Olivares/MIT)