The Arctic hasn’t been this warm for 3 million years – and that foreshadows big changes for the rest of the planet
The Pliocene Arctic was a very different place.
Every year, sea ice cover in the Arctic Ocean shrinks to a low point in mid-September. This year it measured just 1.44 million square miles (3.74 million square kilometers) — the second-lowest value in the 42 years since satellites began taking measurements. The ice today covers only 50 percent of the area it covered 40 years ago in late summer.
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