Adapted photos:
Licenced under Creative Commons Attribution-Share Alike 3.0 Unported
1. Polar Bear (Sow), Kaktovik, Barter Island, Alaska by Alan Wilson (http://www.naturespicsonline.com/galleries/Nature33/_mg_2673.htm)
2. Greenland Icecap by kaet44 (http://www.flickr.com/photos/kaet44/1444405471/)
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