Heard Island - "barometer of global warming"

Or so says the Sydney Morning Herald in its usual style of doom-and-gloom alarmism. Under the headline "Seeing Heard is believing in global warming" (which I had to read about four times before understanding it...) it wails:

The latest bulletin from Heard Island in the Southern Ocean says temperatures are up, rapid retreat of glaciers continues unabated, and a peninsula has been split by the sea to create a new island.

No possibility of all this being caused by anything else, other than global warming? No? Just wondered, because Heard Island is in fact one enormous volcano... as is its neighbour, McDonald Island, which (the article itself concedes) has doubled in size in only a few years.

From the Australian Heard Island website:

Volcanic activity has been observed at Heard Island since the mid 1980s, with fresh lava flows on the southwest flanks of the island.

I wonder what lava flows do to glaciers? Or local temperatures? And I wonder what volcanic activity does to land levels? Move them around a bit maybe?

Personally, I won't be relying on this particular "global warming barometer"...

Read it here.