Earlier this year, in an exposé in The New Yorker, Rachel Aviv detailed the story of Syngenta, an agribusiness firm that was sued by the community water systems of six states in a class-action lawsuit over the firm’s herbicide atrazine.

Photo courtesy of Shutterstock
Photo courtesy of Shutterstock

Atrazine is the second most commonly used herbicide in the U.S. and is used on more than 50 percent of all corn crops. It is one of Syngenta’s most profitable chemicals with sales of more than $3 million a year. Banned in the EU, atrazine remains on the market in the U.S. despite scores of scientific publications demonstrating its role in abnormal sexual development. Almost insoluble in water, atrazine contaminates drinking water supplies at 30 times the concentration demonstrated to cause severe sexual abnormalities in animal models. It is estimated that 30 million Americans are exposed to dangerous levels of atrazine.

Recently unsealed court documents from the lawsuit have disclosed how Syngenta launched a multimillion-dollar campaign to disrepute and suppress scientific research, and influence the U.S. Environmental Protection Agency (EPA) to prevent a ban on atrazine.

Tyrone Hayes, a professor of integrative biology at UC Berkeley has demonstrated in his research that atrazine leads to health problems, reproductive issues and birth defects. Hayes is a vocal proponent of legislative action to ban the dissemination of atrazine in water supplies. The court documents showed that Syngenta specifically attacked Hayes’ work with its smear campaign.

In addition to smear campaigns, Syngenta hired a private detective agency to look into the personal backgrounds of scientists on an advisory panel at the EPA, the judge presiding over the lawsuit and Hayes. The documents also reveal a host of third-party organizations and independent “experts” who were on Syngenta’s payroll and supplied with Syngenta’s data in order to make public statements or write op-ed pieces in support of atrazine. Often, these experts were supplied directly with material that company employees edited or wrote.

Syngenta’s Coverup

It all started in 1997 when Hayes was employed by Syngenta to study atrazine, which was under review by EPA. Hayes’ experimental research on the developmental growth of frogs began to reveal that even at levels of atrazine as low as 0.1 parts per billion (ppb), the chemical was capable of causing males to develop as hermaphrodites. Some males developed female organs and were even capable of mating with normal males and producing eggs. As reported in top peer-reviewed journals such as PNAS and Nature, at exposure to 0.1 ppb atrazine the frogs showed extremely reduced levels of testosterone and feminized voice boxes.

As Hayes amassed data, Syngenta downplayed his results, citing problems with statistics or asking him to repeat studies, often nitpicking or questioning his credibility or scientific skills.

In 2000, Hayes resigned from the panel. He continued to speak at conferences, publicizing his ongoing research in the lab. Meanwhile, Syngenta employees began to show up at conferences to publicly besmirch his data. Sporadically, the campaign turned into threats of violence. In a Democracy Now interview with Amy Goodman, Hayes said:

Tim Pastoor, for example, before I would give a talk, would literally threaten, whisper in my ear that he could have me lynched, or he said he would send some of his “good ol’ boys to show me what it’s like to be gay,” or at one point he threatened my wife and my daughter with sexual violence.

Shockingly, even though Syngenta settled the lawsuit for $105 million in late 2012 after eight years of litigation, it still maintains that amount of atrazine present in the water is much lower than would be required to cause damage. In an article in Forbes published a week after the New Yorker story, Jon Entine criticized Hayes and claimed that “after numerous follow up studies by the EPA and a score of scientists … evidence of endocrine related problems Hayes claimed to have identified … are nowhere to be found.”

This is a patently false assertion. A mere scientific literature search shows dozens of peer-reviewed articles showing atrazine-induced defects in animal models. A number of papers on salmon and fish find similar results to those in frogs: fish exposed to atrazine showed major reproductive abnormalities in both males and females, low sperm counts and low testosterone levels in males. Similar defects have been observed in reptilesResearch in rats has demonstrated decreased fertility, effects on sperm count, increased prostrate disease in males and poor mammary development. A collaborative effort of an international team of scientists confirmed these studies by demonstrating feminization of male gonads across vertebrate species.

All signs point toward the same being true for humans. Said Hayes:

A number of epidemiological studies in humans have associated atrazine with impaired reproduction and a decline in sperm count and fertility. Another study looking at increased prostrate disease in workers who are exposed to atrazine in the production plant in St. Gabriel, Louisiana. A number of studies now show birth defects in humans exposed to atrazine: gastroschisis where the intestines are on the outside of the baby when it’s born, choanal atresia, an effect where the oral cavity and the nasal cavity close up. Most recently, there’s been work showing atrazine associating with three different types of genital abnormalities in males.

Corruption Within the EPA

Interestingly, the scientific advisory panel to the EPA recognizes this wealth of scientific data. In a memo from the 2012 review the advisory panel repeatedly calls attention to the biased methodology employed by the EPA. In fact, the advisory panel disagreed with almost every conclusion the EPA made.

Hayes explained: “The panel was only making recommendations, they don’t make decisions and so the EPA doesn’t need to listen to them. This really undermines the role of the scientific advisory panel.”

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