Greenland’s ice sheet is melting at a record-breaking rate—but it’s not all tumbling straight into the sea. A significant portion of Greenland’s meltwater—which forms on the surface during the summertime and can pool into lakes—finds its way straight through the ice sheet to the bedrock. There, it disperses and lubes up the ice-bedrock interface, substantially accelerating the flow of ice to the sea which, theoretically, causes the sea level to rise and exposes more ice to melting.
