Sarah Zhang points out that people who want less damage to the environment should support GM technology in farming:
Genetically modified Bt crops get a pretty bad rap. The pest-killing Bacillus thuringiensis (Bt) bacteria protein these plants are bioengineered to make has been accused of harming monarch butterflies, honey bees, rats, and showing up in the blood of pregnant women.
Just one problem: None of that is true. (Click on any of those links to see a scientific refutation of each claim.) Seven independent experts in genetically modified crops I spoke to all confirmed that the science shows Bt crops to be safer than their alternative: noxious chemical insecticides.
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But just as we do not blame a murder on, say, a knife, Bt technology is not to blame for the ills of industrial agriculture. After all, knives are pretty handy in the kitchen when we use them properly. Even critics will acknowledge that Bt crops have led to a sharp decrease in insecticide use, which is a huge net positive for the environment. Broad spectrum chemical insecticides kill often and kill widely, wiping out “natural enemies” that are helpful pest-eating critters like spiders. A massive 20-year study just published in the journal Nature found that using Bt cotton in China to control cotton bollworms closely tracked with a rebound in natural enemy populations, which in turn keep out secondary pests like aphids that usually proliferate when chemical insecticides kill the bollworms.
If that last sentence sounds complicated, it is. Integrated pest management is about recognizing the interconnected complexity of these ecosystems of plants and all the insects living on them. The Nature study found that pest control through Bt cotton even had spillover benefits to the non-Bt soybeans growing around them. Natural enemies like ladybugs, spiders, and lacewings keep pests unaffected by Bt at bay. “Maintaining the biological control agents we already have is one of the cornerstones of integrated pest management,” says William Hutchison, an entomologist at the University of Minnesota. In addition, a 2010 study by Hutchison in Science (PDF) showed that American farmers of non-Bt corn actually reaped two-thirds of the economic benefit (read: additional profit) from nearby Bt-related pest suppression.
