The decrease in sea ice not only has a negative impact on marine animals such as polar bears, seals, and walruses, but also has an impact on the lives of people along the coast by increasing waves that would normally be suppressed by sea ice. .If global warming continues at this rate, it is thought that eventually there will be almost no sea ice in the Arctic during the summer. The letter 'a' on the far left represents the Arctic Circle in the 1980s, when it was covered with sea ice even in summer, and the typical sea ice area during this period was 5.5 million. However, unlike the Greenland ice sheet, which took thousands of years to form, sea ice is formed by freezing due to annual temperature changes. Therefore, even if an ice-free Arctic occurs, it is possible to increase the extent of summer sea ice again by reversing climate change.
