how much methane do cows contribute
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how much methane do cows contribute
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how much methane do cows contribute, how much methane is released by cows, why do cows produce so much methane, do cows make methane, cows produce methane gas, cows and methane production, methane gas production by cows, what percentage of methane comes from cows, methane produced by cows, effects of cows producing methane, methane gas from cows