Last week the scientists warned that a third of the world's polar bears could disappear in the next 40 years.

上周，科学家们警告说，世界上三分之一的北极熊可能会在未来40年里消失。

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Global warming has posed a serious threat to the survival of animals such as polar bears.

全球变暖对北极熊等动物的生存造成了严重威胁。

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Scientists fly in a helicopter, over the places where polar bears live.

科学家们乘坐直升飞机，飞过北极熊的栖息地上空。

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He was inspired when visiting a remote Inuit community in Northern Canada, and now wants to share his experiences of seeing polar bears and the Arctic.

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Ms Eaton's staff told The Globe and Mail newspaper that the senator was a fan of polar bears - she has several photos of the Arctic beast in her office.

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One night as Churchill's "bear season" was gearing up, I sat down with Kevin Burke, a man who has lived with polar bears all his life, as both a Churchill native and a ranger in the deep bush country.

WSJ: Are Polar Bears Really Disappearing?

But he argues that would be a bad outcome for polar bears.

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