File name: ArcticSeaice_max_min_1979-2021_2000.gif
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Percent difference from average sea ice extent in the Arctic at each year's summer minimum in September (bright blue) and winter maximum in March (dark blue) from 1979–2021. Sea ice is declining 5 times more quickly in summer than it is in winter. NOAA Climate.gov image, adapted from Figure 1 in 2021 Arctic Report Card: Sea Ice.