The truth about Antarctica...

Lots of media claims last week about warming on Antarctica...here's the truth...

Another example last week was the much-publicised claim, contradicting all previous evidence, that Antarctica, the world's coldest continent, is in fact warming up, Antarctica has long been a major embarrassment to the warmists. Al Gore and co may have wanted to scare us that the continent which contains 90 per cent of all the ice on the planet is heating up, because that would be the source of all the meltwater which they claim will raise sea levels by 20 feet.

However, to provide all their pictures of ice-shelves "the size of Texas" calving off into the sea, they have had to draw on one tiny region of the continent, the Antarctic Peninsula – the only part that has been warming. The vast mass of Antarctica, all satellite evidence has shown, has been getting colder over the past 30 years. Last year's sea-ice cover was 30 per cent above average.

So it predictably made headlines across the world last week when a new study, from a team led by Professor Eric Steig, claimed to prove that the Antarctic has been heating up after all. As on similar occasions in the past, all the usual supporters of the cause were called in to whoop up its historic importance. The paper was published in Nature and heavily promoted by the BBC. This, crowed journalists such as Newsweek's Sharon Begley, would really be one in the eye for the "deniers" and "contrarians".

But then a good many experts began to examine just what new evidence had been used to justify this dramatic finding. It turned out that it was produced by a computer model based on combining the satellite evidence since 1979 with temperature readings from surface weather stations.

The problem with Antarctica, though, is that has so few weather stations. So what the computer had been programmed to do, by a formula not yet revealed, was to estimate the data those missing weather stations would have come up with if they had existed. In other words, while confirming that the satellite data have indeed shown the Antarctic as cooling since 1979, the study relied ultimately on pure guesswork, to show that in the past 50 years the continent has warmed – by just one degree Fahrenheit.

One of the first to express astonishment was Dr Kenneth Trenberth, a senior scientist with the UN's Intergovernmental Panel on Climate Change (IPCC) and a convinced believer in global warming, who wryly observed "it is hard to make data where none exists". A disbelieving Ross Hayes, an atmospheric scientist who has often visited the Antarctic for Nasa, sent Professor Steig a caustic email ending: "with statistics you can make numbers go to any conclusion you want. It saddens me to see members of the scientific community do this for media coverage."