Earth's last Glacial Maximum period began around 33,000 years ago, when vast ice sheets covered much of the Northern Hemisphere. At the time, the Eurasian ice sheet -- which covered much of Scandinavia -- contained approximately three times the amount of frozen water held in the modern-day Greenland ice sheet. But rapid regional warming saw the ice sheet collapse over a period of just 500 years, according to authors of the study published in Nature Geoscience. Analysing sediment drill cores from the Norwegian Sea, the team found that the ice sheet's collapse contributed to an event known as Meltwater 1A...