سایت هات بت : “مواد شیمیایی برای همیشه” در بیش

A polar bear mother and her two cubs walk along the shore of Hudson Bay near Churchill, Man. in this Wednesday Nov. 7, 2007 photo. They're etched onto canadian coins, are part of Canada's national identity and lure tourists to the Arctic every year, but the majestic Canadian polar bear could pose a significant risk to northern communities if climate change continues to wreak havoc on its natural habitat. (AP Photo/The Canadian Press - Jonathan Hayward)

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