Vikings forced out of Greenland by 'cold climate that saw temperatures plunge by 4C in just 80 years'

Daily Mail
"A cold snap in Greenland in the 12th century may help explain why Viking settlers vanished from the island, scientists claim. Researchers reconstructed temperatures by examining lake sediment cores in west Greenland dating back 5,600 years. Their findings indicated that earlier, pre-historic settlers also had to contend with vicious swings in climate on icy Greenland. .....The study, by scientists in the U.S. and Britain, added the previously unknown 12th century temperature plunge as a possible trigger for the colonies' demise. Vikings arrived in Greenland in the 980s, during a warm period like the present."