Or, you planned and lived with it. The cold is also why we have white people...vitamin 'D' and all.
The main effects of a sudden, permanent change in climate That brings on a mile+ high ice sheet, is sudden death. When most of the world locks up it's water in ice sheets, the rest of the world looks like a cold, drafty version of the Kalahari, when it doesn't look like God's own flash flood. Instead of the daily weather report, it was probably the daily dust storm, earthquake, and flood report. If you are a slow-breeding, clawless, fangless, nouveaux social predator, and you don't develop smarts and foresite fast, you probably don't win this race.