Antarctic volcanoes causing glacier thinning?

Antarctic volcanoes identified as a possible culprit in glacier melting - International Herald Tribune:

Another factor might be contributing to the thinning of some of the Antarctica's glaciers: volcanoes.

In an article published Sunday on the Web site of the journal Nature Geoscience, Hugh Corr and David Vaughan of the British Antarctic Survey report the identification of a layer of volcanic ash and glass shards frozen within an ice sheet in western Antarctica.

"This is the first time we have seen a volcano beneath the ice sheet punch a hole through the ice sheet" in Antarctica, Vaughan said.

Of course, the implications of this article couldn't be left alone by the author; grasping conjecture had to be inserted at some point, for later we see:

Volcanic heat could still be melting ice to water and contributing to thinning and speeding up of the Pine Island glacier, which passes nearby, but Vaughan said he doubted that it could be affecting other glaciers in western Antarctica, which have also thinned in recent years.

So, one can see how a disclaimer was put in to still allow for man-made climate change!