Its been about 2/3 of average rainfall so far this year in central Missouri...for some reason SE Missouri seems to have been getting a lot of rain that has missed or partly missed here the last month or 2...we got a pretty good soaking here yesterday, though. More important to long-term, I hear that they closed the barge shipping season early on nthe Missouri River so they can store water in upstream reservoirs so they can release it by April 1 2007 and open the shipping season then...articles say 7 year drought on upper Missouri. But, I don't think a drought in one region, even if compared to 100 years, proves anything about climate change...it has to be looked at world-wide. If climate belts change, some areas will become better for certain crops and some worse. The problem is that there are a heck of a lot more people now than during the big glacial-interglacial climate changes of the last couple million years (including the last 20,000 years), and these people are not free to just migrate from one country to another.
Interesting that the crops you mention do not like change....it does seem to be part of predictions of climate change that there will be more fluctuations..

Chris