Read here. The predicted "accelerating" sea level rise has been a fearmongering staple of the IPCC's global warming alarmists and the mainstream press for decades. For pure hysteria sake, nothing beats the image of flooding populous coastal areas with the intent to frighten the public.
Unfortunately for the alarmists, the empirical evidence does not support their grossly speculative predictions from discredited climate models.
Firstly, the "accelerating" global sea level rise has not taken place as multiple research studies have documented.
Secondly, the alarmist creed that the melting of Greenland's glaciers would cause devastating ocean rises has been completely debunked by a new peer reviewed study on some 200+ glaciers on the world's largest island.
"...titled “21st Century Evolution of Greenland Outlet Glacier Velocities” [Moon et al.] examined the flow characteristics from nearly 200 glaciers across Greenland for the period 2000-2010 as analyzed using synthetic aperture radar data collected from various satellites...And what they found...was that the patterns of flow rate changes across Greenland were complex, both in space and time. Glaciers that were accelerating during a few years were found to be decelerating in others. Some accelerating glaciers were found in close proximity to other glaciers that were decelerating..."Finally, our observations have implications for recent work on sea level rise...Our wide sampling of actual 2000 to 2010 changes shows that glacier acceleration across the ice sheet remains far below these estimates, suggesting that sea level rise associated with Greenland glacier dynamics remains well below the low-end scenario (9.3 cm [3.7 inches] by 2100) at present...Our result is consistent with findings from recent numerical flow models."" [Twila Moon, Ian Joughin, Ben Smith, Ian Howat 2012: Science]
Conclusion: Accelerating global sea level rise from melting glaciers is not happening as predicted. The retreat of Greenland's glaciers is not a major contributor to sea level increases and there exists no empirical evidence that this will change by year 2100.