An outbreak of extreme heat across Europe this month is finally subsiding—and it may be headed for the Arctic next. According to meteorologists, the weather system is moving north toward Scandinavia and Greenland.

It’s a welcome relief for cities like Paris, which reached an all-time high of 108.7 degrees Fahrenheit last week, or Cambridge, England, which logged a record-breaking 101.7 degrees. But it’s bad news for the Arctic, where experts warn that the heat may spur intense melting of the Greenland ice sheet and the region’s sea…