Arctic ice is seasonal. It melts down in the summer sun and relative warmth, then freezes back up when fall’s chill comes. Or at least, it should be that way. But right now it’s late October, and the ice in Siberia’s Laptav Sea still hasn’t refrozen. It’s the latest ice-free date the sea has seen in recorded history and is driving Arctic sea ice as a whole to its lowest point on record for this time of year.
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