按照他们的预计,若大气中的二氧化碳、甲烷以及其他温室气体持续增加,到本世纪末夏季的北极海冰将完全消失。
At current rates of shrinkage, by contrast, this looks likely to happen some time between2020 and 2050.
但是相较之下,依现在的消融速率,这一情况将可能在2020年到2050年之间发生。
The reason is that Arctic air is warming twice as fast as the atmosphere as a whole.
其原因是由于北极的空气正在以大气整体的两倍速度暖化。
Some of the causes of this are understood, but some are not.
其中部分根源已经被了解,但仍有一些未能解开。
The darkness of land and water compared with the reflectiveness of snow and ice means thatwhen the latter melt to reveal the former, the area exposed absorbs more heat from thesun and reflects less of it back into space.
与强反射的冰雪表面相比,当其融化后露出下面深色的陆地或水体时,这部分区域将从太阳吸收到更多的热量而仅仅反射更少的部分到空中。
The result is a feedback loop that accelerates local warming. Such feedback, though, does notcompletely explain what is happening.
结果造成了一个局部暖化加速的恶性循环,尽管这种反馈机制未能完全解释当下正在发生的事情。
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