Arctic sea ice is ebbing faster than normal, and by September it could bottom out at a very low level

Under frigid winter conditions, the Arctic’s floating lid of sea ice typically expands to a maximum extent in March. But thanks to human-caused global warming, that maximum seasonal spread of the ice has been shrinking over the years — and this past March it reached the lowest level ever observed for the month.

But then, something unexpected happened: In May, sea ice retreated much more sluggishly.

This prompted some people who deny the reality of humankind’s impact on the climate to p

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