There are two ice sheets on Earth – Greenland and Antarctica. Both are located at high latitudes and and high altitudes. Temperatures are too cold over the vast majority of the ice sheets to ever melt.
Alarmists have made a big stink about melting along the lower fringes of the western edge of the Greenland ice sheet. If you have ever flown over Western Greenland in late summer (I have several times) you can see that the ice there is almost pitch black. It is covered with soot or dirt and as a result melts for a few weeks every summer.