There are many theories about why Vikings disappeared abruptly from Greenland in the mid-15th century. A team of researchers says another key factor has been uncovered that could help to explain why the Vikings fled: a rise in sea levels.
Theories include drought, changing temperatures, social unrest, and the overhunting of walrus tusks — conditions that would have made Norse colonies in Greenland economically nonviable. Now, a team of researchers from Harvard University and Pennsylvania State University say they have uncovered another key factor that could explain why the Vikings fled: a rise in sea levels.
This change might have been due to the loss of land that was suitable for growing crops. The idea that sea levels would have been rising as temperatures fell is a little counterintuitive, according to the researchers. Cooler global temperatures are usually associated with falling sea levels. However, Earth’s oceans aren’t like a bathtub, and the study noted that changes in sea level don’t affect all areas equally.
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