What do we know about stress on plate tec. in relation to all that fixed stable ice suddenly being melted (I say "suddenly" since the current rate of speed is faster than any natural climate change in the Earths history) and putting more stress on the planet. Absolutely nothing. What can be expected from ...in the span of a few decades ...the release of so much frozen fixed mass and weight on the planet? What can be expected of said fixed weight of the polar icecaps which help to stabilize the "wobble" of our planet when they overnight (in terms of the rate of speed unnaturally occurring) disappear? What additional stresses on the planet then? How much? and where? and their effect?
If you take a glass of water and fill it...then toss some ice cubes in and top it up... What happens when the ice cubes melt if the glass is left untouched ? The ice melts..and the glass overflows...