An animation shows the year-to-year variability of Arctic sea ice, based on simulations produced by the Community Climate System Model. (Animation Copyright UCAR.

• 最新研究推测：到2040年，由于北冰洋大部分在夏季将成为宽阔的水面，这比之前预计的提早了几十年，一部分原因是温室气体的排放导致全球变暖的结果。