The latest massive piece of evidence of climate change appeared this weekend - about the size of Jamaica.

The Wilkins ice shelf off the coast of Antarctica finally disintegrated after decades of melting due to global warming. Last year it shrank by 700 square miles of area or about 14% of its size. This huge shelf was held in place by a thread of remaining ice only 500 metres wide.

The Wilkins is by far the largest ice shelf to break away so far and scientists naturally worry that this is a sign of things to come. The southern continent has warmed by 3 degrees Celsius in the last 50 years and the pace is picking up steam

The collapse comes the same weekend as a new study from the Scientific Committee on Antarctic Research (SCAR) showing one third of all Antarctic sea ice will disappear by the end of the century.

The report found that ice coverage on the Antarctic Peninsula alone has decreased by 27,000 square kilometres in the past 50 years.

Early numbers put out by SCAR suggest the collapse of Antarctic sea-ice not only pushes up anticipated sea level rises but will threaten the numbers of native animal species including emperor penguins, humpback whales and several fish species.

Their research also shows sea temperatures in the Southern Ocean are rising faster than in other oceans, and that ice melts in the Antarctic Peninsula and Western Ice Shelf will be greater and more rapid than expected.

As the world dithers, climate scientists are peering into their crystal balls to predict when the next shoe will drop. In a new study published in the Proceedings of the National Academy of Sciences, a team of international researchers led by Elmar Kriegler of the Potsdam Institute for Climate Impact Research surveyed 43 leading scientists to estimate the likelihood of a tipping point occurring in the near future.

The four tipping points the researchers studied include the restructuring of the Atlantic meridional overturning circulation (also known as the ocean conveyor belt or thermohaline circulation), the complete melting of the Greenland ice sheet, the disintegration of the West Antarctic ice sheet, and the increased frequency of the El Niño Southern Oscillation (ENSO) phenomenon.

Based on the scientists’ feedback, they concluded that there is a one in six chance that at least one tipping point will be triggered under conditions of medium warming (2 – 4ºC) and a more than one in two chance (56%) under conditions of high warming (4 – 8ºC) by 2200.

A paper published this week in the prestigious journal Nature shows that in fact Antarctica is getting warmer, consistent with an overall trend of global temperature rise.

For years, industry-funded “skeptics” have been harping on in the mainstream media that Antarctica was getting colder instead of warmer. This apparently was evidence that global warming was all a big mistake.

Stating the obvious, the authors of this latest study said that warming temperatures in Antarctica are “difficult to explain” without linking them to carbon emissions from the burning of fossil fuels.

Misinformation about Antarctic cooling has been frustrating for researchers trying to communicate the seriousness of climate change to the public.

"The thing you hear all the time is that Antarctica is cooling and that's not the case," said Eric Steig of the University of Washington in Seattle, lead author of the study in Thursday's edition of the journal Nature.

Here's the first two audio podcasts we've heard via satellite from DeSmogBlog contributor Todd Carmichael as he attempts to become the first North American to ever cross the Antarctic and reach the South Pole solo and unaided.

Enjoy.

Day 5: Hunkered Down

Day 6: On the move again

Dear Mr. President-Elect,

Greetings from Antarctica!

I'm about to begin my mission to become the first American in history to reach the South Pole, solo and unaided. I'll start walking November 8th from the edge of the ice pack and, if all goes according to plan, arrive at the Pole just after Christmas. If you have a minute around then, I'd love to hear from you, just ring my satellite phone.

It's the least you could do, I mean, I delivered the vote for you here in the Deep South (so to speak).

A study in the journal Polar Biology concludes that two recently discovered species of Killer Whale inhabiting the Antarctic sea are at risk due to the effects of global warming at the South Pole.

These fish-eating Killer Whales rely on the ice where fish bunch up in schools in order to evade predators. Scientists are anticipating that as the ice patterns in the Antarctic continue to be altered by climate change, the Killer Whales may not be able to adapt to their new hunting grounds.