Polar Bears On Thin Ice ( National Geographic Magazine ) 北極熊

The Arctic is warming so fast that by 2050 it may be largely ice free in summer. Without their frozen hunting platform, how will polar bears survive?

Polar Bears - Photo Gallery - Pictures, More From National Geographic Magazine http://ngm.nationalgeographic.com/2011/07/polar-bears/schulz-photography 

National Geographic: On Thin Ice - Polar Bears International
http://www.polarbearsinternational.org/news/national-geographic-thin-ice
polar bear | Not Exactly Rocket Science | Discover Magazine
http://blogs.discovermagazine.com/notrocketscience/tag/polar-bear/
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj6Etfc14zyxm2HTz08ZiTfXLAzCho_mjzt51Een_kcIIud3EBxA7SfyVuEhzeSxbmlIpSmnQeEwTAPVGOA20Fa2woR6Cj3ilgG3phWg012ZVIzNmt0wCyykFslEqFTwVpLbsnfFmMIB5Q/s1600/Earth.jpg

Photograph by Paul Nicklen

Polar Bear and Cubs Picture, Svalbard Wallpaper - National Geographic Photo of the Day http://photography.nationalgeographic.com/photography/photo-of-the-day/polar-bears-svalbard-pod/

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