The last expansion of the polar ice sheets took place about 18,000 years ago.

最后一次扩大发生在一万八千年前。

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The melting of glaciers, ice caps and polar ice sheets on land, however, has the potential to account for much more.

然而，陆地上的冰川、冰盖和极地冰盾的融化有更大的潜在力量。

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At present, it becomes a research hotspot in the world to study the changes of elevation and mass balance of polar ice sheets by satellite altimetry.

提要采用卫星测高技术研究两极冰面高程变化和物质平衡状态是目前国际研究的一个热点。

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To be more specific, the article discusses a study published in the journal Science states that higher temperatures over the past two decades have contributed to a nearly half-inch rise in global sea levels since 1992, attributing about 30% of that increase to melting of polar ice sheets.

FORBES: Man The Lifeboats! Global Warming Has Oceans Rising At Alarming Rate! (Or Maybe not)