Polar regions today are sparsely populated, ice being lousy place to build anything and long commute to anything, location, location, location.
If ice were to melt, over 1.75 million kilometers squared would become available for mineral extraction, habitation, etc.(okay, maybe not so much agriculture) in Greenland alone, to say nothing of Antarctica, the lonely continent.
Ice has vanished from poles before in history of planet and so can be expected to do so again, so what are consequences bad and good?