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Nullius in verba
In the geological record, rapid increases in GHGs has always resulted in rapid increases in temperature. Now the physics of this does not care whether the increase is caused by Trapp volcanics impigning on coal seams, or mankind burning fossil fuels. Add GHGs to the atmosphere, and you get temperature increase. And if that temperature increase is rapid enough, you get an extinction event.
yep AND they're called "GHG's" for a reason as well.