Panel (a) True color composite of one MODIS granule showing Marine stratocumulus clouds with ship tracks as well as upper-level ice clouds.

a组的由MODIS卫星拍摄复合而成的真彩图，颗粒状和船舶形层积云曲目以及海洋上层冰云。

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If this warming up took place, the ice caps in the poles would begin to melt, thus raising sea level several metres and severely flooding coastal cities.

如果这种变暖发生，两极的冰帽将开始融化，从而使海平面上升数米，并严重淹没沿海城市。

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In contrast, should another ice age occur, sea level would drop drastically.

相反，如果另一个冰河时代来临，海平面会急剧下降。

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That study used computers and current ice-level information to predict future ice levels.

VOA: special.2009.05.05

That's what the low-level ICE agents were doing.

CNN: 'Rogue' DHS unions follow Obama's lead on deportation

However, the fact that more ice rests below sea level means that on millennial timescales, increased amounts of ice are potentially vulnerable to ocean melting.

BBC: Antarctic ice volume measured

The time taken for the waves to complete this journey is recorded, and it is a fairly straightforward calculation to work out the height of the ice above sea level.

BBC: Arctic ice thickness 'plummets'