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So, is that a lot or a little? How much do cows produce? How much does human activity release? (Honest question; I don't know.)

It's estimated there's 1300G tons of methane stored in tundra.

1300 * 10^9 is about 100 years of 2020 CO2 activity.

13 * 10^6 is 100/1000 years of 2020 CO2 activity, I guess.