The maker of Roundup weedkiller has insisted British consumers are safe to use the product after a United States jury backed a groundsman's claim the pesticide contributed to his terminal cancer.
The case of Dewayne Johnson, 46, a groundsman who works at a school in Benicia, California, and is suffering from non-Hodgkin's lymphoma, was the first lawsuit to go to trial alleging that glyphosate - a key ingredient of weedkillers - causes cancer.
But Johnson's lawyer Brent Wisner said the verdict "shows the evidence is overwhelming" that the product poses danger. "I hope it gets the attention that it needs".
DeWayne Johnson, a groundskeeper at a San Francisco Bay Area school district, sprayed large quantities of the product, sold under the brand name Roundup, from a 50-gallon tank attached to a truck during gusty winds.
In an emailed response, the firm said: "While Bayer and Monsanto continue to operate independently, Bayer believes that the jury's verdict is at odds with the weight of scientific evidence that the use of glyphosate is not associated with non-Hodgkin's lymphoma".
After Friday's verdict a company executive, Scott Partridge, maintained that glyphosate is "safe for use and does not cause cancer".
"Monsanto made Roundup the oxycontin of pesticides and now the addiction and damage they caused have come home to roost", said Ken Cook, President of the Environmental Working Group, a USA environmental organization that researches toxic chemicals and advocates for corporate accountability.
In a statement after losing the eight-week trial, Monsanto said it was "sympathetic to Mr Johnson and his family" but it would "continue to vigorously defend this product, which has a 40-year history of safe use". "This should send a strong message to the boardroom of Monsanto". They deliberated for three days before awarding Johnson $250 million in punitive damages and $39 million in compensatory damages.
"You not only see many people injured, you see the corruption of public officials, the capture of agencies that are supposed to protect us from pollution and the falsification of science".
Four years later Johnson - now near death, according to his doctors - has been awarded a staggering sum of $289 million dollars in damages in a case against agricultural giant Monsanto.
It came after the France-based International Agency for Research on Cancer, which is part of the World Health Organization, said in 2015 that glyphosate was a "probable human carcinogen".
Dressed casually, Johnson had a brief exchange with his lawyer when that figure was revealed, then bowed his head as another one of his lawyers patted him on the back and whispered to him.
"The majority of our illnesses and losses to soil quality, water, wildlife and marine life are due to toxic chemicals, particularly Monsanto's most widely used glyphosate herbicides like Roundup and Ranger Pro".
They said he even once contacted Monsanto after developing a rash, and wasn't told of any risk, the AP reported.
A Californian jury said Monsanto should have warned users about the dangers of its Roundup and RangerPro weedkillers.