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"The Vikings stripped the land of trees in order to clear land for pasture. The amount of hay needed to maintain livestock herds over the long winter took up most of the available farmland."

"Trees, which dendrochronologists (those who study tree rings) could use to reconstruct climate are virtually nonexistent from the Viking time period due to the cutting-down of the available trees for survival purposes. What we know is that climate fluctuates over time, and Greenland is no exception."

http://www.iupui.edu/~geni/documents/Vikings_in_Greenland-An_Overview.doc