As with human health risks, it’s unlikely that all the potential environmental harms of genetically modified foods have been identified, but here are some of the main concerns about GMOs.
Lower level of biodiversity: By making a crop resistant to a certain pest, the food sources for other animals could be removed. Also, the addition of foreign genes to plants could be toxic and endanger the animals that consume the plant.
Spread of altered genes: Novel genes placed in crops won’t necessarily stay in designated agricultural fields. The genes can easily spread via pollen and share their altered genes with non-genetically modified plants.
Creation of new diseases: Some GM foods are modified using bacteria and viruses, which means they could adapt and create new diseases.