Arctic sea ice extent, a measure of the ocean area in the northern hemisphere that is at least 15% sea ice, has trended down in past decades (National Snow & Ice Data Center). The question will be suspended on 3 April 2025 and the outcome determined using graph data as provided by the National Snow & Ice Data Center's (NSIDC's) "Charctic Interactive Sea Ice Graph" at approximately 5:00PM ET on 4 April 2025 (Charctic Interactive Sea Ice Graph, click "Arctic" on the left side above the graph, About Charctic Data). The question will close as of the date of the highest reported Arctic sea ice extent (the most recent if there is a tie for the lowest extent). Other site data is immaterial. As of the launch of this question, the highest daily reported Arctic sea ice extent in 2024 was 15.008 million sq. km on 14 March. Confused? Check our FAQ or ask us for help. To learn more about Good Judgment and Superforecasting, click here. To learn more about how you can become a Superforecaster, see here. For other posts from our Insights blog, click here.