Again a common practice of climate deniers is to focus a single glacier event. This particular glacier is constantly used by them and its bogus. Coastal glacier such as in Glacier Bay and PWS are not good examples of global warming anyway. GB glaciers may not be retreating very fast, but they are thinning rapidly. There are two things going on. One you see, the other maybe not. That would be like focusing on a single ice choked cove in the Northwest Passage as an example that global warming is a hoax. As a whole, glaciers around the world are melting faster than ever recorded my modern man and has evidenced by glaciologist and other scientist in geologic bore samples. 

It took awhile to get to 400ppm CO2. Now it happens everyday, thus the Vietnam reference.

FWIW North facing glaciers have a much slower rate of retreat that glaciers on other aspects, and yes elevation.  In Alaska I see all the land based glaciers melting rapidly except those on high north