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>The issue is mostly that it’s presumably cheap to fix unlike a billion cows all farting.

It's even cheaper to fix the farting cows: Just stop raising cows.

Of course, if you want to supplement beef and dairy products, it's not that easy. But if we would believe that global warming and methane were a problem, we could make a difference within weeks.

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Even just killing all a billion would be quite expensive by comparison. You can’t exactly do it for 0.01$/ cow and fixing this would likely cost significantly less than 10 million.

You have forgotten that all of those cows will already be killed, with a profit.

Not everywhere and especially not anytime soon. India has more than 3,000 institutions called Gaushalas maintained by charitable trusts that care for old and infirm cows. It’s a whole religious thing.

Also, enforcing rules isn’t free. Trying to enforce a cow ban would get really expensive.

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