Read here. Researchers found that really huge and long lasting droughts plagued the central portion of the U.S. prior to modern times. These droughts dwarfed the famous 'Dust Bowl' drought that occurred during 1930's. The findings indicate that sea surface temperatures and solar output are principal causes of drought cycles. CO2, natural or human, not a factor at all.
- But it is more than interesting that we are told drought will become more common as greenhouse gases buildup in the future, and that variability will increase giving us an undesirable combination of droughts and floods. But as we look at these two recent articles, we see that during the 20th century, and during a time of substantial increase in greenhouse gas concentration, droughts were actually less severe than during the mid-Holocene and variability decreased as well.
