What happened to the Greenland colonists?

For decades, researchers have debated the cause for the disappearance of the Norse colonists in Greenland. Where they massacred? Assimilated? Or did they starve? Now scientists think they have the answer.

"'When the climate deteriorated, and their way of life became more difficult, they did what people have done throughout the ages: They looked for a more opportune place to live,' says Niels Lynnerup, a forensic anthropologist at the University of Copenhagen in Denmark who studies the Norse."