A World Wildlife Fund photograph taken along the western shore of Hudson Bay in November 2010 shows a female polar bear with two cubs near Churchill, Canada, in this image released to Reuters on February 9, 2011. [Xinhua/Reuters]
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![A World Wildlife Fund photograph taken along the western shore of Hudson Bay in November 2010 shows a female polar bear with two cubs near Churchill, Canada, in this image released to Reuters on February 9, 2011. [Xinhua/Reuters]](http://images.china.cn/attachement/jpg/site1007/20110210/0014222d98500ebdc61f14.jpg "A World Wildlife Fund photograph taken along the western shore of Hudson Bay in November 2010 shows a female polar bear with two cubs near Churchill, Canada, in this image released to Reuters on February 9, 2011. [Xinhua/Reuters]")
