The Polar Sea already has exceeded its 30-year life cycle - it was commissioned Feb. 23, 1978.

该船已经超过其30年的生命周期——1978年2月23日接受服役。

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Additionally, an unknown quantity of methane in the form of hydrates (or clathrates) lies trapped beneath the polar sea floors.

此外，未知数量的甲烷以水合物(或气水化合物)的形式被困在极地海洋海底之下。

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The countries bordering the Polar Sea have clear responsibilities towards the region, and by implication should view exploiting it for energy as a last resort.

斯塔·豪特指出：“北冰洋周边的国家对这片区域有明确的责任，这里应作为能源开发的最后领域。”

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The Arctic's importance has gained extra strategic and economic significance as melting ice in the polar region strengthens the feasibility of nations to use the Northern Sea Route (NSR) across the top of Russia and the Northwest Passage through Canada's Arctic archipelago.

CNN: China eyes Arctic options in energy, transport

Are you terrified by the melting polar ice cap, rising sea levels, extreme weather, and other growing threats from global warming?

FORBES: Want to Save the Planet? Just Slack Off at Work, Study Says

"The grim news about polar bears and sea ice decline is horrifying, but it is a call to action, not despair, " said Kassie Siegel of the Center for Biological Diversity.

BBC: NEWS | Science/Nature | US predicts polar bear meltdown