For most people, 40 years is a very long time. But from the perspective of NASA’s science chief, Ellen Stofan, it’s the blink of an eye:
As a geologist, I’m used to thinking of things that are rapid as happening on a timescale of 10 to 20 million years. When you see the rate of change happening in the Arctic, it is quite concerning. As scientists we’re not used to seeing such a rapid pace of change . . . This is a warning of the worst effects of climate change.
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