GM Crops Are Great -- If You Like Superweeds, That Is

A report has found that farmers are planting too many so-called Roundup Ready crops. These plants are genetically engineered to resist the herbicide Roundup, which allows farmers to spray the chemical to kill weeds without harming their own crops.

But overuse of this approach to weed control is becoming a problem. Use of Roundup has increased to the point that weeds are also becoming resistant to the chemical. That means that farmers have to start using additional herbicides, some of them even more toxic than Roundup.

More than 80 percent of the corn, soybean and cotton crops grown in the United States are genetically engineered.

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