在2000年前，南极冰川一直被认为处于平衡状态，融化流失的冰会和降雪达到平衡。
Before 2000, the ice on Antarctica is thought to have been roughly in balance overall, with new snowfall balancing ice lost through surface melt and icebergs.
一项新的分析指出，全球变暖，南极洲西侧大冰川融化，导致海平面上升的预期值要比原先的减半。
A new analysis halves longstanding projections of how much sea levels could rise if Antarctica's massive western ice sheets fully disintegrated as a result of global warming.
为什么南极的冰川融化，沉入海洋？
Why are the ice sheets descending into the oceans on Antarctica melting?
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