So naturally the mass of all the melted ice on the planet becoming water.. in the world... is not going to have any impact at all then...
and I would imagine that the effect of the "Greenland air conditioner" melting away won't have any effect either.

pure poppycock

The thawing of the various ice ages we have had ...took a long time to achieve...likewise their advancements again...

we are doing it in a time frame not in 10's and 100's of thousands of years as nature has.
With plenty of time for the planet to adapt, and the species on it to adapt...
We are doing it in mere decades.
What stress is put on species, what stress is put on the planet?
I can tell you that here..a very large and long running study spanning a good chunk of time has indicated that my country's lost a very large chunk of its fauna in the last 40 years. 60% is the estimate.

Climate changes...
Naturally over millennia.
Climate changes artificially induced over mere decades the impact is different..

The difference is dramatic ..
between being hit by a slow-motion moving down-filled pillow..
and
being hit by a Japanese bullet train with a diamond tipped spike on the front travelling at speed.
tell me which of these two models of speed of "change" is most likely survivable?