The "Lost Squadron" that ditched in southern Greenland in 1942 was found buried under 268 feet of ice in 1992. How can the glaciers be advancing even as the globe is warming? Hmmmmmmm?!?!?!
That's an easy one. Warmer ocean waters produce more atmospheric water vapor by evaporation, which leads to more precipitation (snow). Glacial advance is caused by more snow on the glacial source if ablation rate remains constant. Even if ablation rate increases, if snowfall on the glacial source increases (and there's a lag time of several years, too), then the glacier will advance.
That's why glacial advance/retreat is not a good indicator of short-term (decadal scale) global warming or cooling trends, because glacial advance and retreat is a combination of meteorological factors.