For year after year across vast areas of North America rainfall was low. Summers were parched and the heat excessive. Plants withered and sand dunes moved freely across a formerly green landscape. Human settlements had to be abandoned and populations migrated, forcing social change. By some measures the drought lasted more than a decade.
Summary Provided by:
http://www.ldeo.columbia.edu/res/div/ocp/drought/
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Tree-Ring Laboratory, International Research Institute for Climate Prediction, Lamont-Doherty Earth Observatory, Columbia University
