There is now ample evidence to support a major retreat of most mountain glaciers during the last 100 years in response to widespread increases in temperature.
In recent decades, the rate of glacial recession has increased tremendously.
Mountain glaciers (IPCC)
There are some exceptions - the higher situated parts of some glaciers may receive more precipitation due to global warming. In parts of the Antarctic there is therefore more snow than usual. There may also be more snow on the highest peaks on Greenland glaciers. However, since the lower parts melt or fall into the sea at an increasing pace, the net effect is clearly that the glaciers of the world are retreating