The vast Arctic ice sheet shrinks somewhat as the seasons shrink. Near the edge, there is an ultra-thick ice layer that will persist and will not melt even in summer. We call this ice sea ice for many years (pink below). However, because the average temperature of the earth has been rising, scientists have found that in the past 40 years, the sea ice for many years has ceased to last, and has begun to shrink from about 7 million square kilometers, leaving only 4 million square kilometers, that is, the area equivalent to India has disappeared. This new discovery has led to the question of when the sea ice that has been in existence for many years will completely melt, that is, by then, the Arctic ice will completely melt.
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