Herbicide-tolerant (HT) crops, allowing utilization of otherwise-deathly herbicides for weed control, and insect-resistant (Bt) crops, have grown rapidly as a share of total US crop acreage. Both genetically-engineered cotton and corn reached 90% of their total crop production; biotech soybeans surpassed even that, with 93% of soybean acreage. America leads the world in GE crops-- 40.8% of global production.