Open thread for night owls: Record-breaking heatwave could mean record-breaking melt in Greenland...

Last week's European heatwave is moving north toward the Arctic, where temperatures could trigger record melting in Greenland and affect sea levels worldwide for millennia.

That's according to meteorologist Eric Holthaus, who said on Twitter Monday that the melting event from the heat could result in the loss of 40 billion tons of ice.

"This single heat wave will create a permanent change in our oceans that will linger for millennia," said Holthaus. "We are in a climate emergency."