Careful study of the history will show that Greenland did have some open fjords that had trees and grasses growing, but it's an oversimplification to say that Greenland used to be green. Fluctuations in the ice sheet have happened more than a few times, but's it's never come close to going away. Eric The Red is said to have named it Greenland not so much as an accurate description of the place but rather as a way to encourage colonization by people who'd never seen it.

The quoted portion reminds me of that Woody Allen movie from long ago that takes place in a future where they're all eating pork chops and smoking cigarettes because they'd discovered that they're actually good for you.

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