First sentences: "The Arctic Ocean once froze reliably every year. Those days are over.". Climate aside, there are still seasons - it's not surprising to see time-lapse videos of this happening.
You can see the seasonal chart later in the article, across several decades. The concern is the long-term trend. The strong El Nino effect of the last few years appears to go unmentioned, which would be my only concern.
You can see the seasonal chart later in the article, across several decades. The concern is the long-term trend. The strong El Nino effect of the last few years appears to go unmentioned, which would be my only concern.