by Julie Fidler, Natural Society:
As of July 7, 2017, glyphosate, a chemical found in Monsanto’s RoundUp herbicide, has officially been listed as a carcinogen in California under the state’s Proposition 65 law. 
Under the law, RoundUp, the most widely-used herbicide in the world, must carry a warning about its potential to cause cancer in humans. It is the first time that any governmental authority has created such legislation based on glyphosate’s possible carcinogenicity.
The California Office of Environmental Health Hazard Assessment (OEHHA) must still complete the task of setting a limit for acceptable daily exposure to the weedkiller. Agency scientists have proposed a limit of 1.1 mg a day, which is 127 times less than the U.S. Environmental Protection Agency’s (EPA) legal allowance for the average-sized adult.