Loss of Arctic Sea ice at least 70% man made

Not exactly shocking news, James Annan reports on the recent paper investigating:

how much of the decline in sea ice was plausibly due to various natural phenomena like the Atlantic Multidecadal Oscillation and Arctic Oscillation. The answer…maybe a little, but not a lot.

The Guardian has more:

We could only attribute as much as 30% [of the Arctic ice loss] to the AMO [Atlantic multi-decadal oscillation],” he said. “Which implies that the rest is due to something else, and this is most likely going to be man-made global change.”

Previous studies had indicated that around half of the loss was due to man-made climate change and that the other half was due to natural variability.

Looking across all his simulations, Day found that the 30% figure was an upper limit – the AMO could have contributed as little as 5% to the overall loss of Arctic ice in recent decades.

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