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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.
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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.
In November 2009, Monsanto scientists found that the pink bollworm had become resistant to first generation Bt cotton in parts of Gujarat, India.
DuPont estimates that Monsanto has 98% of the US soybean market and 39% of the corn market.
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