Argument: GM crops mix with native plants and reduce genetic diversity
"What's wrong with GM?". Catholic Institute for International Relations (CIIR) - Genetically modified organisms (GMOs) threaten plant biodiversity. Planting GM crops is not a question of choice: once they are planted somewhere, crops elsewhere become contaminated by them. This could be especially disastrous for organic farmers. For example, although it is illegal to grow GM maize in Mexico, in 2001 researchers found that traditional maize varieties grown by farmers in two remote Mexican states had been contaminated with GMOs from GM maize.2 There are thousands of varieties of maize in Mexico. If contaminated by GMOs, these precious indigenous varieties could be irretrievably lost.