The area covered by sea ice in the Arctic has shrunk for a fourth consecutive year, according to new data released by US scientists. They say that this month sees the lowest extent of ice cover for more than a century. The Arctic climate varies naturally, but the researchers conclude that human-induced global warming is at least partially responsible. They warn the shrinkage could lead to even faster melting in coming years. "September 2005 will set a new record minimum in the amount of Arctic sea ice cover," said Mark Serreze, of the National Snow and Ice Data Center (NSIDC), Boulder, Colorado.
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