Conflicting conclusions on glyphosate risk may stem from what it's mixed with

| | November 17, 2015

The GLP aggregated and excerpted this blog/article to reflect the diversity of news, opinion and analysis.

Glyphosate, widely known by its trade name, Roundup, probably gets more attention than any other herbicide. It's one of world's most-used weedkillers, and it is also closely linked to the growth of GM crops.

Monsanto invented Roundup, and also invented crops that grow well when it's used on them. Farmers find that combination almost irresistible.

So in March, when the World Health Organization's International Agency for Research on Cancer classified glyphosate as a probably carcinogen, it set off a furor. The IARC's announcement was especially noteworthy because glyphosate has long been considered among the least toxic pesticides used by farmers.

Now, another group of cancer experts has weighed in, further complicating the scientific debate.

The group, which was convened by the European Food Safety Agency, has reviewed the available scientific data on glyphosate and concluded that it probably does not cause cancer.

The European group took pains to explain why its assessment differs from that of the IARC. They considered a slightly different group of studies, for one thing. It only looked at studies of glyphosate by itself, for instance, rather than studies of glyphosate as it is sold to customers. These commercial formulations generally include a mixture of chemicals, and some of these other ingredients may be more more dangerous than glyphosate itself.

Any regulatory decisions in Europe about glyphosate-based herbicides will involve a close look at those commercial mixtures.

Meanwhile, the U.S. EPA has been carrying out its own review of glyphosate's risks. The agency reportedly has finished a "preliminary risk assessment" of the chemical, and could release results by the end of the year.


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