Melting sea ice affects ecosystems and currents. It does not affect sea levels, because floating ice is already displacing water of a weight equal to its own.

融化的海冰影响着生态系统和水流，但它不影响海平面，因为浮冰已经置换了相同重量的水。

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Layers of frozen sea water, known as sea ice, cap the Arctic Ocean. The ice grows dramatically each winter, and melts just as dramatically each summer.

北冰洋的冰层由结冰的海水构成，这些冰层在每年的冬天急速冻结，又在每年的夏天迅速消融。

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The problem of water deficiency is serious along the coastal areas of North China, but there are a large scope of sea ice in the Bohai Sea and the northern part of the Huanghai Sea.

我国北部沿海地区缺水问题十分严重，但冬季在渤海及黄海北部形成较大范围的海冰。

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Dr Pettitt said Jersey became connected to the west of France during the Ice Age, when water was locked up at the poles as ice and sea levels were low.

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And now the Arctic's upper layers are getting less dense, for several reasons: melting Arctic glaciers, rising surface-water temperatures, increased precipitation and an absence of salt concentrations resulting from sea-ice formation.

ECONOMIST: The science

Absorption is particularly fast in cold water so the Arctic is especially susceptible, and the recent decreases in summer sea ice have exposed more sea surface to atmospheric CO2.

BBC: Arctic Ocean 'acidifying rapidly'