The warming process gathers pace. 变暖的过程在加快

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
346. The concentration of carbon dioxide...
     近几十万年以来
347. Hasn't been so high for several hundred thousand years.
     二氧化碳浓度从来没有如此之高

来自《家园 第二部分 Home Part2》第 344 行