The average temperature at the South Pole is -49C.
The average temperature at the North Pole is -25C.
The Poles go through 6 months of darkness each year (which means any ice that melts in the summer is going to freeze back 100% in the winter.)
Antarctica has been frozen over for about 40 million years, ever since continental drift moved the continent to the South Pole.
Greenland has been frozen over for about 15 million years, ever since continental drift moved the island/continent close enough to the North Pole.
They are not going to melt.
Give those figures to your lefty friends next time they say the Poles are going to melt.
Why is it called Greenland?
It gets even more complex than that, because the real question is the band of near-zero...and warming will shift that, changing snowfall.