Mid-20th century Arctic sea ice levels were lower than expected

An international research team has reconstructed Arctic sea ice levels, revealing significant declines in the 1940s, a period previously thought to have stable ice coverage. Published on July 26, 2024, the study indicates that this decline occurred during the Early 20th Century Warming, when anthropogenic greenhouse gas emissions were low. The findings provide a new baseline for understanding climate variability and future sea ice predictions.