It is clear that you have a few misconceptions concerning global warming (and no it has not changed to climate change - climate change is a consequence of global warming in a cause effect relationship. The term climate change was popularized by the Bush administration). First, if global temperatures are constant, then the Antarctic Ice sheet remains constant. Since we have 13 years of direct measurements of ice mass showing increasing loss, this is strong evidence that temperatures in Antarctica are increasing (although there is some increase in air temperature, most of the extra heat is comes in from the adjacent Antarctic Ocean). Yes, Antarctica has lost and gained mass before but there is no indication it has done so since the last glacial period of the current ice age.
Interesting that it requires heat for an ice age - energy is required for evaporation. In fact, while lots of heat is required, there certainly is a lot less heat during to create and during a glacial period. It is fairly easy to figure this out as a glacial period is difficult to trigger without a significant decrease in solar input (about a 20-30% drop in incoming solar radiation is required).
Northern Canada is not cold enough to accumulate snowfall enough to lead to an ice age. This has not been the case in the last 10,000 years when summer heat is sufficient to remove any snow accumulated during the winter months. However, over the last 40 years, the increased heat has led to significant continental ice losses and also explains why the permafrost zone has moved significantly northwards.
Finally, I am somewhat curious why you write why we don't understand global warming (climate change) when it is more truthful to suggest that 'you' don't understand global warming. Simple enough to ask if you don't understand something and seems less appropriate because you don't know something to claim it is fake science.