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Drought is the most serious physical hazard to agriculture. In the US, the ' Dus t Bowl ' droughts of the 1930s and 1950s are the m...

The 1000 year cycle tends to break down into halves of about 500 years each. Centering on the dates of 375 BC, 30 AD, 460 AD, 955 AD, and 14...

The occurrence of an 18- to 20-year cycle in weather in the U.S. Midwest is no longer controversial. The controversial issue is the cause. T...