Another Paper Confirms Greenland's Accelerating Ice Loss

Here's a plot about Greenland's ice, from a recent paper in The Cryosphere by Hurkmans et al.

But note that the y-axis isn't the amount of ice in Greenland, it's the rate of change of the amount of ice, dM/dt.

In other words, it's the acceleration of ice loss. Eyeballing it, it looks like a change of about 325 Gt/yr in 13 years, or an acceleration of about 25 Gt/yr², in agreement with Enderlin et al 2014 (27.0 ± 9.0 Gt/yr² since 2000) and Wouters et al 2013 (25 ± 9 Gt/yr²).

It doesn't seem like much, but: if the melt rate for 2008 were to continue to 2100, with no acceleration, the loss in ice would be about 25,000 Gt, or 1% of Greenland's 2.6 M gigatons of ice. And it'd be another 1% for each century that goes by.

But with an (constant) acceleration of 25 Gt/yr², the loss in 2100 will 106,000 Gt, or 4% of Greenland's ice, if I did the math correctly.

With the same acceleration, 18% of Greenland's ice would be gone by 2200, 74% by 2400, and all of it before 2500 -- 7.2 meters (24 ft) of sea-level rise. And that's with the same acceleration as today, which, given the world's trajectory, doesn't seem likely.

Greenland's ice gone in 400-500 years at most. Coastal cities mostly underwater. Is that a tragedy, or is it something worse?