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Cool thing about methane is that it naturally decreases over time on its own. It interacts with other molecules in the upper atmosphere (I can't remember which ones right now, but a Google search would turn it up) to split apart into two more benign compounds. Methane has decreased consistently over time until humans started rice farming (produces lots of methane) and animal husbandry (cow burps.) It's encouraging, because it means that if we stopped those activities (fat chance), then the methane would eventually go back to pre-industrial levels.
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