Tree Rings Record History of Drought

Using tree rings, researchers have created a record of droughts dating back hundreds to thousands of years. 

neil-pederson-tree-ring
By studying variations in tree rings in forests around the world, Neil Pederson and colleagues at the Tree Ring Laboratory at Columbia University’s Lamont-Doherty Earth Observatory in New York have created a record of droughts and wet periods dating back hundreds to thousands of years.  In 2010, while researching the effects of climate change over the past 20 years in Mongolia, his team serendipitously stumbled across a stand of pines that has since revealed the longest-ever climate...
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