text: So climate changes abruptly, rapidly, and all on its own. No CO2 needed. It can, does, and has, rapidly warmed. Im not going to quote the whole paper at you. Just a couple of cherry picked points about the fact that some places, during some of this time, were warmer than today . At least, per the beetles. Now if it can warm up to warmer than now in some places, all on its own, and without any CO2 from humans, seems to me it could be doing that right now all on its own too.