I read a book awhile back about a thriving technological society in full bloom before the last ice age. The work was pure fiction but thought provoking. Maybe the last ice age wiped out all signs of the civilization and the only survivers became the hunter/gatherers of our early history. Would there be any signs or would the glaciers have ground everything into tiny bits of nothing? According to the ice core samples, ice ages occur fairly often on our little world. If the next one is particularly harsh, how could we save ourselves? Could we survive?