evidence: The Arctic is warming faster than anywhere else on the planet, and as a result, sea ice in the Arctic Ocean is decreasing. Sea ice loss has far-reaching effects on the planet because the ice helps regulate Earth’s climate, influences global weather patterns, and affects ocean circulations. Sea Ice Today began as a way to make sea ice science and analysis more relevant and accessible. In combination, NASA data and NSIDC expertise provide easy-to-use resources and tools to increase our understanding of climate change in the Arctic. Since 2007, this site has been a go-to source for blog-like insights, analysis, and data visualization tools that communicate how sea ice has been changing from year to year. We receive over two million page visits a year and our content is used by a wide range of users including journalists, the general public, academics, and scientists alike. Our analyses focus primarily on sea ice extent, which is a measurement of the area of ocean where there is at least some sea ice. In the Arctic, the annual minimum sea ice extent occurs in September and the annual sea ice maximum extent occurs in March. In the Antarctic, the minimum extent occurs in February and the maximum occurs in September. When compared with previous years and decadal averages, these periods when the annal extremes occur are particularly important indicators of how much ice is being lost over time.