A California judge has rejected Monsanto's appeal to overturn a landmark jury verdict which found that its popular herbicide causes cancer. Dewayne Lee" Johnson, a father of three and former school groundskeeper ... won a $289m award over the summer after alleging that his exposure to Roundup weedkiller gave him cancer. Monsanto, now owned by Bayer, the German pharmaceutical company, filed an appeal of the verdict, which said the company was responsible for "negligent failure", knew or should have known that its product was "dangerous", and had "acted with malice or oppression". San Francisco superior court judge Suzanne Bolanos ... has ruled to reduce punitive damages from $250m to $39m. The August verdict was a major victory for campaigners who have long fought Roundup, the most widely used herbicide in the world. Studies have repeatedly linked the glyphosate chemical ... to non-Hodgkin lymphoma (NHL), a type of blood cancer. Internal Monsanto emails uncovered in the litigation suggested that the corporation has repeatedly worked to stifle critical research over the years while "ghost-writing" scientific reports favorable to glyphosate. Thousands of plaintiffs across the country have made similar legal claims, alleging that glyphosate exposure caused their cancer or resulted in the deaths of their loved ones. Last week, four jury members spoke to the Guardian about the judge questioning their unanimous decision, urging her to allow the verdict to stand.