In other words Mr H, The rate of glacier calving has increased...

In other words Mr H, The rate of glacier calving has increased very substantially as a result of global warming.

However, as with all weather related phenomena, there are multiple factors in play.

Here's one link to illustrate the difficulty of associating one calving glacier with global warming.

http://www.livescience.com/17416-greenland-iceberg-calving-record.html

This article looks at some of the consequences expected from increasing melt rates.

http://guardianlv.com/2014/07/antarctic-glacier-calving-rate-increase-caused-by-ice-shelf-melting/