“Every single day so far in 2023, we’ve observed sea ice that’s been below average,” says climate scientist Zachary Labe of Princeton University and the National Oceanic and Atmospheric Administration, who created the graph below. The dark-blue line shows the median area of sea ice between 1981 and 2010, a figure called the “extent” that researchers measure in millions of square kilometers. The red line below all the others is the extent so far in 2023.
“In fact,” Labe continues, “it broke its lowest point ever recorded in the satellite era. Which was striking, because last year, we also had broken that record.”
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