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@futurebird
I’d venture maybe a scar like one of history’s other mass extinctions? Because this is a mass extinction, and one of the fastest in the planet’s history. (Even the K–Pg Extinction may have unfolded over centuries or millennia.)

The outcome of those past extinctions: Earth filled with life again, but different life. The scar remains in the evolutionary history and its outcomes, visible in contrast (but only in contrast) to what came before.