Just think, within our lifetimes we'll be able to explore this canyon by foot.
Millions might have perished from the global warming and it's adverse weather and sea-line effects, but we could explore Greenland, so who cares about that.
In addition, it's estimated that a complete melting of the ice sheet would increase sea levels by ~24ft[2] and that's not taking into account the larger impact of the rest of the world melting (Antarctic ice sheet is much larger).
[1] http://commons.wikimedia.org/wiki/File:Topographic_map_of_Gr...
Even ignoring sea level rises due to ice loss elsewhere and the fact that the area we're discussing already appears well below sea level, the average ratio of bedrock rise to decrease in ice shelf thickness has been running at about 1:10 in recent years.
Earth seems to have a lot of built in corrective measures, for both the issues it causes and the ones we think we cause.