影片介绍
TodaytheNorthPoleiswarmingtwiceasfastastherestoftheplanet.TheArcticicecapislessthanhalfthesizeitwas50yearsago.Thisradicalclimatechangehasthusbeguntoopentheice-packedNorthwestPassagebetweenEuropeandAsia,andsomescientistspredictthatthetransoceanicmaritimeroutewillsoonbepermanentlyicefreeduringitsever-longersummers.
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