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He walks through the mechanics of glaciation with striking simplicity. If ice sheets are growing on land, where is that water coming from? It has to evaporate, travel, and fall as snow. Now imagine winter arrives, cold sets in, snow accumulates. Then spring comes, except it doesn't. And it doesn't come back for ten thousand years. That's the reality of what glacial inception looks like. Snow falls, compacts, never melts, and the cycle repeats for millennia. Over Hudson Bay, the ice eventually reached an estimated one and three-quarter miles thick. This wasn't a gradual drift into cold. This was a threshold crossed, a feedback loop engaged, and an entirely different climate state locked in for fifteen thousand years.