The annual polar bear migration is broadcasting live on explore.org. The idea is the footage will show the condition of the earth’s ecosystem. Viewers will see how global warming has made the ... more 
The annual polar bear migration is broadcasting live on explore.org. The idea is the footage will show the condition of the earth’s ecosystem. Viewers will see how global warming has made the migration tough on the polar bears. less 
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Tue, Nov 6, 2012 6:16 PM EST