By Carey Gillam
Three years ago this month Monsanto executives realized they had a big problem on their hands.
It was September 2014 and the company's top-selling chemical, the weed killer called glyphosate that is the foundation for Monsanto's branded Roundup products, had been selected as one among a handful of pesticides to undergo scrutiny by the World Health Organization's International Agency for Research on Cancer (IARC). Monsanto had spent decades fending off concerns about the safety of glyphosate and decrying scientific research indicating the chemical might cause cancer or other diseases. And even though the IARC review was still months away, Monsanto's own scientists knew what the outcome would likely be—and they knew it wouldn't be good.