the answer is: GMO's

sierra club letter

http://www.sierraclub.org/biotech/whatsnew/whatsnew_2007-03-21.asp

some very interesting links in this article on the Sierra Club, GMO's and an attempt to relate to CCD 
losses.

http://reason.com/news/show/119622.html

the links appears to make a solid argument that GMO crops are not a risk to bees. the issues related 
to Imidacloprid though continue to be of concern. 

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