"This jury found Monsanto acted with malice and oppression because they knew what they were doing was wrong and doing it with reckless disregard for human life," said Robert F. Kennedy Jr., a member of Johnson's legal team. "This should send a strong message to the boardroom of Monsanto."

Monsanto has denied a link between the active ingredient in Roundup — glyphosate — and cancer, saying hundreds of studies have established that glyphosate is safe.

Monsanto spokesman Scott Partridge said the company will appeal. Partridge said scientific studies and two government agencies have concluded that Roundup does not cause cancer.

"We are sympathetic to Mr. Johnson and his family," Partridge said. "We will appeal this decision and continue to vigorously defend this product, which has a 40-year history of safe use and continues to be a vital, effective, and safe tool for farmers and others."