Containers of Roundup, left, a weed killer is seen on a shelf with other products for sale at a hardware store in Los Angeles on Thursday, Jan. 26, 2017. A battle over the main ingredient in Roundup, the popular weed killer sprayed by farmers and home gardeners worldwide, is coming to a head in California, where officials want to be the first to label the chemical, glyphosate, with warnings that it could cause cancer. Chemical giant Monsanto has sued the nation's leading agricultural producer, saying state officials illegally based their decision for warning labels on an international health organization. (AP Photo/Reed Saxon)
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