A while back, I was excoriated for stating that a four degree centigrade rise in average temperature could render much of North America uninhabitable.
Part of that reaction, I suspect, has to do with the nuclear-devastation image that the word "uninhabitable" brings to many minds, perhaps combined with the idea that things would be just as they are except a bit warmer. That's not the way the climate system deals with massive energy inputs (global warming, by a different name).
Who knows, maybe four degrees centigrade is an overestimate.
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College of Liberal Arts and Sciences: Lecturer/Instructor - East Asian Languages and Cultures (F1600038)