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Abstract
In 2018, U.S. farmers planted over 90 percent of corn and cotton acres with genetically engineered (GE) seeds. These GE seeds can be herbicide tolerant (HT), insect resistant (Bt), or both (stacked). Adoption rates vary by trait, crop, and region. In particular, the percentage of acreage planted with seeds that were “stacked” with both HT and Bt traits has greatly increased since 2000.