The US Environmental Protection Agency will complete its first comprehensive review of the country's major genetically engineered crops: corn, cotton and potato plants that deliver their own pesticides, the Boston Globe reports. The agency is awaiting a report by an independent panel of scientists on the safety of the crops, which represent a growing share of the nation's farm production. The EPA will then decide for how long to approve their continued use and in what way those crops must be planted to make sure that pests do not build up a resistance. Since their commercial introduction in 1995, the use of genetically engineered crops has surged. An estimated one-fifth of the nation's corn production now comes from genetically engineered seeds.