Arctic sea ice is melting at its fastest pace in almost 40 years

The Northwest Passage was, again, free of ice this summer and the polar region could be unfrozen in just 30 years

Arctic sea ice has melted to a level not recorded since satellite observations started in 1972 – and almost certainly not experienced for at least 8,000 years, say polar scientists.

Daily satellite sea-ice maps released by Bremen university physicists show that with a week's more melt expected this year, the floating ice in the Arctic covered an area of 4.24 million square kilometres on 8 September. The previous one-day minimum was 4.27m sq km on 17 September 2007.

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