New research published in 'Science' on August 30, 2024, explores common genetic modifications in four major crops: soybean, corn, cotton, and canola. While GM crops can boost yields and profitability, they may also lead to shifts in agricultural practices that can inadvertently affect the environment. For instance, farmers may rely more heavily on pesticides as GM crops become more resistant to herbicides and insect pests.
"Increasing land productivity in the form of greater crop yields can make agricultural land more profitable overall, which can encourage agricultural expansion," said Eduardo Souza-Rodrigues, co-author of the study and an associate professor at the University of Toronto Mississauga's Department of Economics. "However, increased supply may then reduce crop prices, which decreases the conversion of additional land to agriculture elsewhere. These changes have the potential to cause deforestation, pollution, greenhouse gas emissions, and impacts to human health and biodiversity."
"Although we have made progress in understanding the impact GM crops have on our environment, there are much more uncertainties that need to be studied to support good farming practices that are better for the environment," Souza-Rodrigues added.
The study highlights the need for further research into the long-term impacts of GM crops on large-scale agricultural practices and pest resistance. Collecting detailed environmental data, particularly concerning wildlife, will provide better insights into their impacts and aid in promoting sustainable agricultural practices.
Research Report:Environmental impacts of genetically modified crops
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