On thousand years ago Green-land was green, and Vikings grew barley there.
The Vikings in Greenland all froze to death when the weather turned cold.
The 1990 IPCC Report showed the Medieval Warm Period and subsequent cooling.
Greenland is no longer green. White is the new green.
Factual climate history wrecked global warming theory, so government funded scientists who depend on global warming funding for their living, simply erased the Medieval Warm Period.