Greenland is the biggest island in the world, nominally part of Denmark, but virtually uninhabited and moreover largely uninhabitable. But it wasn't always so.
When you come to think about it, Greenland is a pretty weird name for anyone to give to a country that is now 99% glacier or barren rock and 1% lichens. Not the sort of name that springs to mind for such a grey, treeless and windswept place, is it?
But wait. A thousand years ago, Greenland was settled by the Vikings, who prospered, and grew wheat and flax there, and it was at that time that it received its name.
It was, 1,000 years ago, genuinely a green land.
At about the same time, monks in Yorkshire were tending their vines.
If the Vikings could grow wheat in Greenland, and monks in Yorkshire could grow grapes, it was pretty certain that those two spots did not enjoy the same climatic blessings as they do today.