450)=450"> 全球变暖，冰川融化，威胁的是谁。 450)=450"> 全文听写。 450)=450"> 为了六级，为了英语的提高，大家一定要耐心听写喔~~~ Hints: Los Angeles West Antarctic 点我回顾上一期【六级听力室】2011年6月真题短文3(2/2)
Among global warming's most frightening threats is the prediction is that the polar ice-caps will melt, raising sea level so much that coastal cities from New York to Los Angeles to Shanghai will be flooded. Scientists agree that key player in this scenario is the West Antarctic ice sheet, a Brazil-size mass of frozen water that is much as 7,000 feet thick. Unlike floating ice shelves which have little impact on sea level when they break up, the ice sheet is anchored to bedrock well below the sea surface. Surrounded by open ocean, it is also vulnerable, but Antarctic experts disagree strongly on just how unstable it is. Now, new evidence reveals that all or most of the Antarctic ice sheet collapsed at least once during the past 1.3 million years, a period when global temperatures probably were not significantly higher than they are today. And the ice sheet was assumed to have been stable.
在全球变暖时，最可怕的威胁是预测是,极地冰盖将会融化,海平面将升高很多，这使得沿海城市,从纽约到洛杉矶到上海将被淹没。科学家们一致认为,在这个局面中的罪魁祸首是南极西部冰盖，一个巴西大小质量的冷冻水就像7000英尺厚。不像浮动冰架,当它们分裂了之后几乎对海平面没有影响,冰盖是固定在基岩远低于海平面。即使被开放海域环绕,它也是脆弱的,但是南极专家在西南极冰洲到底多不稳定的问题上有着严重分歧。现在,新的证据表明,所有或大部分的南极冰盖在过去的130万年中至少崩溃过一次,当时全球温度可能并不比现在高多少。冰盖被认为是稳定的。 ——译文来自: 蓝短裤0