A cold snap in Greenland in the 12th century may help explain why Viking settlers vanished from the island, scientists claim.

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Researchers reconstructed temperatures by examining lake sediment cores in west Greenland dating back 5,600 years.

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Their findings indicated that earlier, pre-historic settlers also had to contend with vicious swings in climate on icy Greenland.

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Average temperatures plunged 4C (7F) in just 80 years from about 1100.

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Such a shift is roughly the equivalent of the current average temperatures in Edinburgh tumbling to match those in Reykjavik, Iceland.

It would have been a huge setback to crop and livestock production.

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Lead researcher Dr William D'Andrea, of Brown University, Rhode Island, said: 'Climate played (a) big role in Vikings' disappearance from Greenland.

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