K. That is scary stuff, but some scientists remain unimpressed. Patrick Michaels, a climatologist at the University of Virginia, complains about the ACIAs data selection, which he believes may have produced evidence of spurious warming. He also points out, in a new book, that even if Arctic temperatures are rising, that need not lead directly to the ice melting. As he puts it, Under global warming, Greenlands ice indeed might grow, especially if the warming occurs mostly in winter. After all, warming the air ten degrees when the temperature is dozens of degrees below freezing is likely to increase snowfall, since warmer air is generally moister and precipitates more water.
L. Nils-Axel Morner, a Swedish climate expert based at Stockholm University, points out that observed rises in sea levels have not matched the IPCCs forecasts. Since this weeks report relies on many such IPCC assumptions, he concludes it must be wrong. Others acknowledge that there is a warming trend in the Arctic, but insist that the cause is natural variability and not the burning of fossil fuels. Such folk point to the extraordinarily volatile history of Arctic temperatures. These varied, often suddenly, long before sport-utility vehicles were invented. However, some evidence also shows that the past few millennia have been a period of unusual stability in the Arctic. It is just possible that the current period of warming could tip the delicate Arctic climate system out of balance, and so drag the rest of the planet with it.
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