[El Gato]

I suppose some folks might last for a little while in some type of biodomes in the southern U.S

The glaciers never got that far south. Yea it would be cool, but not arctic cold. We only talking a few degrees of difference in average temperature.

That last is the maximum extent of all 4 of the last glacial periods (Nebraskan, the Kansan, the Illinoian, and finally the Wisconsin.)

[21twelve]

Thanks for posting that chart of the temperatures. It is the one that tells me we are overdue for an ice age. Also the vegetation map - I haven’t seen that.

The biodomes would be primarily needed for growing enough crops in the cooler climates. I had an old geologist aquaintance (RIP) that did a lot of research on cold-weather strains of wheat that various universities picked up on. The other thing would be the lack of moisture (more locked up in the ice). Of course that would be a money maker to take some of that Wyoming natural gas, point it at the base of the glacier and light her up and pipeline it south.

[El Gato]

BTW, there is a really cool "dig", at what was apparently a "water hole". Lots of pgymy Rhinos, pre-horses and other non predator species, that just got missed by those glaciers. It's in northern Nebraska, just west of the line which defines the maximum extent of the glaciers. Ashfall Fossil beds

My grandparents farm was just east of the line, in southern Nebraska. You should have seen all the smooth rocks, of various sorts of composition/materials, including flint, quartz, and other stuff, that the farmers kept finding in their fields. Frost heave pushed them up, but the glaciers smoothed them out. Some were nearly spherical, but most were more ovoid. The flint tended to be a very flattened ovoid.