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It's cleared dramatically as the Arctic sea ice is melting. The wiki has satellite pics, it's pretty dramatic https://en.m.wikipedia.org/wiki/Northwest_Passage

• paavokoya 10y ago
  Despite the obvious CO2/warming reasons, wouldn't these research vessels/cruise ships cause more ice melt as well? (Breaking up the ice causing faster melt)
  • roywiggins 10y ago
    The Arctic is pretty big and there aren't many research boats. There are only a few dozen icebreakers in the world. https://news.usni.org/2013/07/23/u-s-coast-guards-2013-reivew-of-major-ice-breakers-of-the-world https://news.usni.org/2013/07/23/u-s-coast-guards-2013-reive...
• soperj 10y ago
  It didn't clear at all last year though if i'm not mistaken. And based on this: https://nsidc.org/data/seaice_index/ https://nsidc.org/data/seaice_index/ It's already closed up again.