NASA scientists spot troubling, extreme melting in Greenland from a plane

NASA scientist Josh Willis flew over Greenland this week, and gazed at a sprawling polar world of melted ice and dark pools of water.

In mid-August, a potent heat wave melted large swathes of the Greenland ice sheet, which is three times the size of Texas. It's a vivid sign of changing times, and climes. In recent decades,...