From phys.org: Rewriting the history books: why the Vikings left Greenland.

One of the great mysteries of late medieval history is why did the Norse, who had established successful settlements in southern Greenland in 985, abandon them in the early 15th century? The consensus view has long been that colder temperatures, associated with the Little Ice Age, helped make the colonies unsustainable. However, new research, led by the University of Massachusetts Amherst and published recently in Science Advances, upends that old theory. It wasn’t dropping temperatures that helped drive the Norse from Greenland, but drought. [continue]