Rising seas threaten west Antarctic  

The ABC has a report on the possibility of a large scale collapse of the ice sheet in West Antarctica.

There's a 'big gorilla hiding the closet' whose collapse could have a dramatic effect on sea levels, according to Australian researchers. Dr Bradley Opdyke, a paleoceanographer from the Australia National University (ANU) believes the West Antarctic Ice Sheet (WAIS) could partially collapse within 20 years, resulting in a dramatic jump in sea levels.

His talk on glacial cycles and the WAIS was presented earlier this month at the Imagining the real: life on a greenhouse earth conference held in Canberra. "The 900-pound gorilla hiding in the closet is Antarctica. We have evidence that it is not a stable beast," Opdyke says.

He says the WAIS is inherently unstable, and the current rate of sea level rise is placing it at risk. "It is pinned on the spines of a few mountains, with ice sheets draped off them," Opdyke says. "If sea level rise unpins these sheets, it is plausible that there will be dramatic ice collapse in the West Antarctic."