We are F%$#ed

The Western Antarctic ice sheet is collapsing, and there is little that we can do to stop it:

The collapse of the Western Antarctica ice sheet is already under way and is unstoppable, two separate teams of scientists said on Monday.

The glaciers' retreat is being driven by climate change and is already causing sea-level rise at a much faster rate than scientists had anticipated.

The loss of the entire western Antarctica ice sheet could eventually cause up to 4 metres (13ft) of sea-level rise, devastating low-lying and coastal areas around the world. But the researchers said that even though such a rise could not be stopped, it is still several centuries off, and potentially up to 1,000 years away.

The two studies, by Nasa and the University of Washington, looked at the ice sheets of western Antarctica over different periods of time.

The Nasa researchers focused on melting over the last 20 years, while the scientists at the University of Washington used computer modelling to look into the future of the western Antarctic ice sheet.

But both studies came to broadly similar conclusions – that the thinning and melting of the Antarctic ice sheet has begun and cannot be halted, even with drastic action to cut the greenhouse gas emissions that cause climate change.

They also suggest that recent accumulation of ice in Antarctica was temporary.

“A large sector of the western Antarctic ice sheet has gone into a state of irreversible retreat. It has passed the point of no return,” Eric Rignot, a glaciologist at Nasa and the University of California, Irvine, told a conference call. “This retreat will have major consequences for sea level rise worldwide.”

It's important to remember what is going on with arctic ice, where the decline has exceeded every reputable prediction, so I would start figure that, along with changes in the Greenland ice fields, we could be looking at 1 meter per decade increase in sea level.