Worst US Drought of Last Millennium Happened in 1934 and was Caused by 'Dirty Thirties' Dust Bowl

October 16, 2014 1:00 PM

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Scientists from Nasa have discovered the drought of 1934 was the worst in North American history over the last thousand years, due to the dust storms of the "Dust Bowl" period.

Using a tree-ring-based drought record from the years 1000 to 2005 alongside modern records, scientists from the US space agency and the Lamont-Doherty Earth Observatory found the drought in 1934 to be up to 30% more severe than the second-worst drought in 1580.

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