History of Extreme Weather (VIDEO)

May 1, 2014 7:54 PM

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Drought continues to plague the west, parching crops and land. Now, researchers have taken a look back in history and have catalogued some of the worst droughts to date with the use of tree rings.

With sandpaper and microscopes, the researchers examined rings from drought-sensitive tree species from the Weber river basin in Utah. This allowed them to create a tree-ring chronology that extends back 585 years into Utah's natural history. They also took modern stream flow measurements to calibra...

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