Genetically modified organisms (GMOs) are crops whose genetic material has been scientifically modified. The document lists several potential disadvantages of GMOs, including harm to other organisms from unintended effects, cross-pollination with traditional crops making organic crops hard to identify, and the spread of resistant "super weeds" and pests. It also notes concerns about health problems, environmental damage, corporate control of the food system, and discrepancies in information about risks and benefits.