fast glaciers....natural not because of global warming

From www.livescience.com...

"A volcano beneath Antarctica’s icy surface has been detected for the first time. ....

Although ice buried the unnamed volcano, molten rock is still churning below. David Vaughan, a glaciologist with the BAS and a co-author of the new study, said the discovery might explain the speeding up of historically slow-moving glaciers in the region."

If you read a little further down in the story you linked to you'll find this:

Vaughan noted, however, that the hidden volcano doesn't explain widespread thinning of Antarctic glaciers.

"This wider change most probably has its origin in warming ocean waters," he said, which most scientists attribute to global warming resulting from human activity, such as the use of fossil fuels.

The volcanic activity is in an extremely localized area and only effecting one glacier.