Figures from the 1980s:
methane production, per animal in kg/year, and total worldwide in millions of tonnes/year:
cattle, 35-55; 54.3
termites, -; 20
sheep, 8; 6.9
goats, 5; 2.4
camels, 58; 1.0 (they're the belchiest of all, it seems)
pigs, 1.2; 0.9
humans, 0.05; 0.3 (they must not know the same people I do)
moose, elk, 31; 0.03.
It seems that cows in the US today produce about 5 times as much methane as the American bison did in its heyday.
methane production, per animal in kg/year, and total worldwide in millions of tonnes/year:
cattle, 35-55; 54.3
termites, -; 20
sheep, 8; 6.9
goats, 5; 2.4
camels, 58; 1.0 (they're the belchiest of all, it seems)
pigs, 1.2; 0.9
humans, 0.05; 0.3 (they must not know the same people I do)
moose, elk, 31; 0.03.
It seems that cows in the US today produce about 5 times as much methane as the American bison did in its heyday.
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