Or "Why does 2 degrees matter?"
replyBecause when were 4 degrees cooler, NYC was under 1000 feet of ice. We really don't want to find out what 4 degrees hotter is like.
Wait really? 1000 feet is insane.
replyIt was actually about 2000 feet. The Laurentide ice sheet, it was 3 kilometers / ten thousand feet thick in some parts.
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replySame here. I'd also add "It's warming, caused by humans, harmful, but mitigating it would be even more harmful."
replyBasically, anyone capable of thinking about it logically has at this point reached the conclusion that it's real. Anyone arguing otherwise is therefore necessarily not thinking about it logically, and you have to expect things like shifting claims.