KANGERLUSSUAQ, Greenland (CNN) -- Take a look at this dramatic video that shows runoff from a heavier than normal ice melt in Greenland that wiped out a bridge near Greenland's largest airport.
NASA says it's never seen anything like this in Greenland in more than 30 years of observations.
Scientists blame the "unprecedented" change on an unusually strong ridge of warm air.
Usually, Greenland sees about half of its ice sheet melt in the summer.