I've been wondering if this would happen, or if it is already happening.. and previous ice lands will thaw and new lands will become polar caps..

I'm actually surprised it only goes back 1500 years. I thought we had as accurate records going back to Egyptian 4k bce? Maybe they are working on that next?

"Climate change" we can do nothing about. Except migrate those of us whom survive, depending on how fast this change happens, if its gradually over 1000's of years or in the span of days.

Perhaps the flashfrozen mammoths with chewed food in their mouth is a hint.

The mammoths were not flashfrozen they just froze to death normally, usually in ditches.

This type of analysis had been done for years. https://www.amazon.com/Historical-Eclipses-Rotation-Richard-Stephenson/dp/0521461944 https://royalsocietypublishing.org/doi/full/10.1098/rspa.2016.0404

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The article says that for this analysis they needed sufficient detail to give them location, date, and time of day within some margin of error. Guessing older ones don’t have the detail they need, or alternately that this analysis has been done for other time periods but not this one.