[speekinout]

The completely ignore the fact that ice is less dense than water and thus takes up more room as a solid than a liquid.

Please don't use that argument. Most of the Arctic glaciers are on land.
The real argument is that the glaciers have grown and receded over the years. If you look at their footprints over the time that we have been tracking them (not much more than 100 years) you really can't tell if this is an extraordinary recession.

[thucydides]

Another aspect is that glacier size relates less to ambient temperature than it does to snowfall accumulation at the glacier's head. According to some, "global warming," if it exists, would cause increased snowfall in cold regions, thereby increasing glacier size.

[Blood of Tyrants]

Incorrect. The Antartic glaciers are over land. The Arctic ice cap is nothing but a floating mass of ice.