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EARTH - XKCD webcomic shows how thick ice was over North-American cities 21,000 years ago

As you can see above, Chicago was relatively spared with only 900 meters of ice (0.55 miles), but Montréal was deep under 3,300 meters (2.05 miles) of ice.

http://www.treehugger.com/climate-change/xkcd-webcomic-shows-how-thick

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