Nature World: A study of climate data taken from trees in the Western US reveals levels of drought that were significantly worse than anything experienced in the past century.
The 1930s drought that triggered The Dust Bowl, considered the worst US drought that century, was barely strong enough to make the list of worst droughts, according to scientists at Brigham Young University in Utah, who analyzed the state's climate record back to 1429.
"We're conservatively estimating the severity of these droughts...