To despite claims made by Monsanto and the GMO industry, many advocacy and environmental groups have warned about the

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dangers of genetically modified crops which, according to a report from the Organic Consumers Association “have been linked to thousands of toxic and allergenic reactions, thousands of sick, sterile, and dead livestock, and damage to virtually every organ and system studied in lab animals”. Since many of the injected genes that are found in genetically modified crops come from sources such as bacteria and viruses not natural to the food consumed by humans, we may only be seeing the tip of the iceberg when it comes to health problems associated with GMO's. It is also contended that the nutritional value of engineered foods are substantially less than what is found in crops that are produced naturally. It is these concerns that worry many French citizens which are in support of the ban.
GMO's not only present problems for human health, but the ecological toll of genetically interfering with crops and other organisms take a terrible toll on the environment as well, driving out natural species, cross contaminating natural vegetation, creating more aggressive species, among other yet unknown problems.