A new paper in The Cryosphere finds some big numbers for ice melt.
Using satellite measurements of ice elevation in Greenland and Antarctica for 3 years -- January 2011 to January 2014 -- they found a combined melt rate for the two ice sheets of 503 ± 103 km3/yr. That's the fastest rate ever recorded.
75% of this comes from Greenland.
That's in line with the earlier results I wrote about a month ago (the number there was 537 km3/yr). And Greenland's melt is accelerating fast; from the numbers here and here I find the acceleration is roughly 30 km3/yr2, or a speedup in the melt rate of about 8% per year. That's a doubling in less than 10 years.
Why does it matter? Ask these people.