"Glyphosate, an herbicide and the active ingredient in Monsanto Co's popular Roundup weed killer, will be added to California's list of chemicals known to cause cancer effective July 7, the state's Office of Environmental Health Hazard Assessment (OEHHA) said on Monday.

Monsanto vowed to continue its legal fight against the designation, required under a state law known as Proposition 65, and called the decision 'unwarranted on the basis of science and the law.'

The listing is the latest legal setback for the seeds and chemicals company, which has faced increasing litigation over glyphosate since the World Health Organization's International Agency for Research on Cancer said that it is 'probably carcinogenic' in a controversial ruling in 2015."

Karl Plume reports for Reuters June 27, 2017. [2]