When Bt corn was first engineered, it was hailed as the perfect weapon to fight off one of the most troublesome crop-devouring pests around: the corn rootworm. And since 1996, when it was first planted, Bt corn has helped US farmers kill rootworms and prevent billions of dollars in damages. Over the years, however, researchers have expressed concerns that the rootworm could become resistant to Bt corn. Bt corn currently makes up 75 percent of US corn.
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