http://current.com/news/92783673_t-r-u-t-h-o-u-t-war-over-monsanto-gets-ugly.htm?xid=PTNiGoog

The Chaco study shows that child cancers increased dramatically in a small Argentinian town between 2000 and 2009, during the same time period that "Roundup Ready" agriculture boomed in the area. (If you don't know yet about "Roundup Ready" crops, they are genetically engineered to survive being coated with Roundup, which kills everything else.) And to the surprise of the public health officials, the people got mad. Real mad.