Add in the fact that the thickness of the ice, which is much harder to measure, is estimatedto have fallen by half since 1979, when satellite records began, and there is probably less icefloating on the Arctic Ocean now than at any time since a particularly warm period 8,000years ago, soon after the last ice age.
除此以外,较难测量的冰面厚度预计比首次有卫星观测记录的1979年降低了一半。现在,漂浮在北冰洋上面的冰块很可能是8000千年前最后一个冰河期结束后的那个极暖期以来最少的。
That Arctic sea ice is disappearing has been known for decades.
数十年前,人们已经认识到北极海冰正在消亡一事。
The underlying cause is believed by all but a handful of climatologists to be global warmingbrought about by greenhouse-gas emissions.
除了少数人以外,几乎所有气候学家都将其归咎于温室气体排放所带来的全球变暖。
Yet the rate the ice is vanishing confounds these climatologists models.
然而海冰消失的速率使这些气象学家建立的气候模型陷入混乱。
These predict that if the level of carbon dioxide, methane and so on in the atmospherecontinues to rise, then the Arctic Ocean will be free of floating summer ice by the end of thecentury.
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