I’m going with glacial melt triggering tectonic plate shifts, releasing flood basalt rivers and millions of tons of SO2. An oldie but a goodie (responsible for 3 mass extinctions so far). One miserable, cathartic end brought to you by the greedy industrialist grifters. Not just possible… probable
On the other hand, the chance of hitting 2 deg of global warming is high and rising and the damage is likely to be far worse. Whether you're bothered is a test of whether you belong to an intelligent civilization.
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...Later, catch ya on the flip-flop.
You know things are bad when we're dreaming of our own destruction.
Asking for friends.
Enough is enough.
But here is a chance!