Rivers and even oceans freeze. Farmlands turn into barren, permafrosted tundra plains. Animals die, plants die, and undoubtedly, you'll buy some extra socks.

Next, after some decades, the first glaciers start moving. Provokingly slow, they begin creeping down from the mountains, crushing everything they encounter, covering ever bigger pieces of land under a thick, lifeless layer of coldness. The icy tongues will crumble one city after the other and munch up entire societies.

By now, you may want to pack your things and move elsewhere. Because there you have it. Ice Age at its best, for a staggering 100,000 years to come. Only the southern hemisphere will be a nice place to be.

It seems like nuclear war is the most imminent possibility. Or a major astroid colliding with the planet. Well, if a large one did we would be extinct, rather a smaller one would cause a change in the atmosphere and starting an ice age. Where the hell did I leave those winter socks? (scratching my head)