With a hat-tip to Lennart van der Linde in the Greenland folder, the following extract from Applegate et al 2014 indicates that the future contributions to SLR from the Greenland Ice Sheet, GIS, is approximately exponential with increasing Greenland surface temperature change (see first attached associated image). Furthermore, I point-out that the Pollard et al 2015 findings (see second attached associated image) indicate that this consideration is even more true for the Antarctic Ice Sheet, AIS, than for the GIS, in the coming 100 to 200 years. These findings imply that if modern society had any meaningful willpower then decision makers could buy future generations a lot more "... time to design and implement improved strategies for adapting to sea level change" by reducing GHG emission sooner rather than later. Alternately, as societal willpower w.r.t climate change appears to be lacking at the moment, future generations may need to get use to climate shock (including abrupt SLR, with possible increases in sea level of up to 5m by 2100) beginning no later than 2050 following a BAU pathway.
Also, I include the third and fourth attached images of the GIS & AIS elevations and latitudes, respectively, to illustrate that while the WAIS is located further pole-ward than the GIS, its elevation is already lower than that for the GIS; which supports the position that major portions of the WAIS may likely be subject to surface ice melting (which leads to hydrofracturing and cliff failures) starting sometime between 2050 and 2100 when following a BAU pathway.
Patrick J. Applegate, Byron R. Parizek, Robert E. Nicholas, Richard B. Alley & Klaus Keller, (2014), "Increasing temperature forcing reduces the Greenland Ice Sheet’s response time scale", Climate Dynamics, DOI: 10.1007/s00382-014-2451-7
http://link.springer.com/article/10.1007/s00382-014-2451-7Extract: "We speculate that near-term reductions in greenhouse gas emissions could pay large dividends in terms of avoided sea level rise. Our results suggest that the relationships between temperature change, GIS response time scale, and GIS equilibrium sea level contribution are approximately exponential (Fig. 2). Thus, the benefit, in terms of avoided sea level rise contributions from the GIS, of a unit of avoided emissions is greatest if emissions reductions are begun before much temperature change has already happened. Alternatively, one could say that mitigation becomes less effective in preventing or delaying sea level rise contributions from the Greenland Ice Sheet as temperature rises. Near-term reductions in greenhouse gas emissions may also buy time to design and implement improved strategies for adapting to sea level change."
Pollard, D., DeConto, R.M. and Alley, R.B., (2015), "Potential Antarctic Ice Sheet retreat driven by hydrofracturing and ice cliff failure", Earth and Planetary Science Letters, Volume 412, 15 February 2015, Pages 112–121, doi:10.1016/j.epsl.2014.12.035
http://www.sciencedirect.com/science/article/pii/S0012821X14007961