The sunbeams that the ice sheet previously reflected back... 过去冰面可以反射阳光

339. Some predictions suggest 2015.
     也有人预言到2015年冰冠就会消失
340. Soon these waters will be
     不久之后 这些冰就会在
341. free of ice several summer months a year.
     夏天的几个月当中融化成水
342. The sunbeams that the ice sheet previously reflected back...
     过去冰面可以反射阳光
343. Now penetrate the dark water, heating it up.
     现在阳光穿透黑色水面 使其升温
344. The warming process gathers pace.
     变暖的过程在加快
345. This ice contains the records of our planet.
     这些冰川包含着我们地球的记录

来自《家园 第二部分 Home Part2》第 342 行