A new study from the National Aeronautics and Space Administration (NASA) has shown that current drought in the United States is not the worst that North America has seen in 1,000 years. According to the study, the drought of 1934 was the worst to strike the continent in the last millennium.

Scientists from the United States government agency and the Lamont-Doherty Earth Observatory used tree ring records from 1000 to 2005 and contemporary weather records to observe drought events in the past. The records and the data gathered by the scientists showed that the drought of 1934 during the Dust Bowl years was the worst. According to the study, in 1934, dry conditions had been spread over 71.6% of North America.

The scientists of the agency do not provide final figures for 2014. As per the report, drought in 1580 was the second worst drought in last 1,000 years.

While talking about the 1934 drought, Ben Cook, climate scientist at NASA's Goddard Institute for Space Studies said, "We noticed that 1934 really stuck out as not only the worst drought, but far outside the normal range of what we see in the record".

Before the 1934 drought, the region had faced drought conditions in 1930-31. One after another over an entire decade, four droughts affected North America. The droughts of 1930-31, 1934, 1936, and 1939-40 had been named the Dust Bowl for the way they changed large regions of the Midwest and Western US into black walls of dirt.

According to the study, the thing that made the 1934 drought most frightening was that human intervention had exacerbated it. Farmers' poor land management practices were supposed to be the reason of causing the deadly dust storms that spring.

Today's more efficient farming techniques guarantee that the US will not see Dust Bowl-level storms again.