题目内容
Potential environmental effects of GM crops include gene flow, pesticide resistance and greenhouse gas emissions.
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The spread of genes from modified organisms to unmodified relatives could produce species of weeds resistant to herbicides that could contaminate nearby non-genetically modified crops, or could disrupt the ecosystem.
Genetic use restriction technology (GURT) "Terminator" would allow the production of crops with sterile seeds, which would prevent the escape of GM traits.
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.
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