Greenland

- armed conflicts with the Inuit.
Jared Diamond suggests that cultural practices, such as rejecting fish as a source of food and relying solely on livestock ill-adapted to Greenland's (deteriorating) climate, resulted in recurring famine which led to abandonment of the colony. However, isotope analysis of the bones of inhabitants shows that marine food sources supplied more and more of the diet of the Norse Greenlanders, making up between 50% and 80% of their diet by the 14th century.