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Genetic use restriction technology (GURT) "Terminator" would allow the production of crops with sterile seeds, which would prevent the escape of GM traits.
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The escape of genetically modified seeds into neighboring fields, and the mixing of harvested products, is of concern to farmers who sell to countries that do not allow GMO imports.
The development of glyphosate-tolerant (Roundup Ready) plants changed the herbicide use profile away from more persistent, higher toxicity herbicides and reduced the volume and harm of herbicide runoff.
A claimed environmental benefit of Bt-cotton and maize is reduced insecticide use. A PG Economics study concluded that global pesticide use was reduced by 286,000 tons in 2006, decreasing pesticidal environmental impact by 35%.
Resistance in GM crops evolves naturally after a population has been subjected to selection pressure via repeated use of a single pesticide.
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