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Fossil methane
(lemmy.world)
Yes, I know it's not technically just methane, but methane is its primary constituent.
"Fossil gas" is also probably a suitable term, but I like "fossil methane" because it gets that spooky chemical name benefit.
Production and transport of fossil gas actually often does exactly that and there are/were satellites tasked with tracking methane emissions (there are also loads of natural fossil sources, sometimes their leaking is anthropogenic).