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WASHINGTON — New research led by the U.S. Geological Survey provides more evidence that the Arctic will be ice-free in the summertime within a matter of decades.
The overall direction of planetary temperatures is the subject of the study, which compares the Earth’s current warming trends to the mid- Pliocene warm period, 3 million to 3.3 million years ago.
Global average surface temperatures during that period, when there was no ice on the Arctic seas during the summer, were about 5.5 degrees warmer than they are now. The world is on track to warm by more than that by 2100.
