14 octubre 2014
A new study using a reconstruction of North American drought history over the last 1,000 years found that the drought of 1934 was the driest and most widespread of the last millennium. Using a tree-ring-based drought record from the years 1000 to 2005 and modern records, scientists found the 1934 drought was 30 percent more severe than the runner-up drought (in 1580) and extended across 71.6 percent of western North America.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/LbH0X16Mmgs/141014150749.htm
