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Yesterday's New York Times ran an article disclosing the rise and spread across the United States of "superweeds" that have developed resistance to the herbicide Roundup. The article comes with a nifty interactive timeline map charting the spread of Roundup resistance into at least 10 species of weeds in 22 states. Uh oh.
Roundup is Monsanto's clever way to encourage use of genetically modified (GM) crops. The company bioengineers the crops to resist Roundup. Farmers can dump Roundup on the soil or plants. In theory, only the GM crops will survive and farmers won't have to use a lot of more toxic herbicides. In practice, this won't work if weeds develop Roundup resistance and flourish too. Then farmers have to go back to conventional herbicides to kill the Roundup-resistant weeds.
In 1996, Jane Rissler and Margaret Mellon of the Union of Concerned Scientists, wrote "The Ecological Risks of Engineered Crops" (based on a report they wrote in 1993). In it, they predicted that widespread planting of GM crops would produce selection pressures for Roundup-resistant weeds. These would be difficult and expensive to control.
At the time, and until very recently, Monsanto, the maker of Roundup, dismissed this idea as "hypothetical."