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xkcd : Earth Temperature Timeline
(imgs.xkcd.com)
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Isn't that more of a recent discovery though? I only mention it cos this comic is from 2016, which, as much as I don't want to acknowledge the passing of time, is 7yrs ago.
It was understood by the early 2010s that the timeline was off. Scientific American ran an article about it at the end of 2012 but it does not surprise me that Monroe would still go by the old timeline in 2016. I only knew about it years ago because I was an undergrad and one of my professors worked extensively in Alaska and neighboring areas during his PhD.