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.
I hadn't either, but found it when looking for that extent map. I though it was worth sharing.
I'd rather use steam, heated by nuclear reactors. Or even solar, which is good for that, since high temperatures are not required, and the energy need not be "dense".
There are better uses for hydrocarbons. Mobile fuel, petrochemical feed stocks. (Think Plastics for the frame of your Glock and the stock of your AR).