A newly published paper says climate change caused by humans could be responsible for as little as half the wholesale melting of sea ice in the Canadian Arctic and Greenland that has amazed and alarmed scientists. The finding, published in Nature magazine, should caution those attempting to turn global theories into regional predictions, said co-author Mike Wallace of the University of Washington. "Whenever you start to look at local climate trends, you have to look at the internal variability as well as the human-induced variability," said Wallace. "The natural variability is huge." Sea ice has been a hot topic in recent years -- with average declines of 2.6 per cent per decade since the late 1970s across the circumpolar world. Ice extent last March was the fifth lowest for that month in the satellite record.

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