he first sudden warming happened 14,700 years ago. The temperature in Greenland increased by more than 10 degrees, and in the milder climate, called the Bølling period, the first people of the Stone Age went towards Northern Europe and Scandinavia.

But joy did not last long. 12,900 years ago the ice age stroke once more with a new severely cold period, which lasted until 11,700 years ago, at which time the ice age ended ultimately. The ice cores from Greenland, which reflect the climate in the Northern Hemisphere, show that tremendously fast climatic changes were involved.

The ice age ended in one year