Sort of like how Eskimos of various tribes were in Alaska for 10,000 to 15,000 years before white people arrived there from Russia and Europe there were also people "Living on the Ice" literally in igloos with small fires inside to stay warm during storms and wind and everything else.
For example, once I got caught in a blizzard on MT. SHASTA IN A white out going from Bunny Flat in 1970 at Christmas with two friends trying to get to Horse Camp emergency Lodge for climbers and we couldn't see our hands in front of our faces so we dug a snow cave to survive the night. I found that just a candle in an ice cave or igloo might keep you warm enough by heating up your hands if you also have a plastic Ground cloth and sleeping bag to stay warm in.
So, some people survive on glaciers from Alaska and Northern Canada and Greenland and Siberia and always have for at least 15,000 years.
However, I think many people during ice ages simply moved to warmer locations nearer the equator too possibly by Boat or dog Sled over the snow.
Before trains the main way people got around a lot was on rivers and oceans by sailboats. Then when trains came people used trains more if they could afford passage on a train or they used Covered Wagons or even horseback to travel all across the country to better places to live.
So, migration has always been a part of human survival strategy and different people choose different ways of surviving almost anything.
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