• The majority of GM agricultural products are developed specifically for toxin-resistance- namely higher doses of herbicides/pesticides sold by the largest producing companies, like Monsanto, even though the industry’s marketing pitch claims that bioengineered seeds and plants will help the environment by reducing toxic herbicide and pesticide use.

• Cultivating genetically cloned (and thus compositionally identical) seeds and plants has historically led to a loss of survival means, where infections and diseases in plants will spread like wildfiress. The variety of a particular crop provides adaptability, creating a constant resource to combat these infections.
• Genetically modified plants have alternative ways to create photosynthesis- they are hyper-tolerant and thus can be sprayed repeatedly wtihout killing the crop. However, residues are left on the plant, which the consumer will ingest. It was recently revealed that the government (to accomodate Monsanto, the leading GM corporation) raised pesticide residue limits on soy products from 6 parts per million to 20 parts.
• Glyphosphate, the active ingredient of Ready Roundup, an herbicide produced by Monsanto, was the third leading cause of farm worker illnesses.
• Klebsiella planticola, genetically modified bacterium, is meant to break down wood chips, corn stalks, and lumber wastes, actually renders the soil sterile. It killed essential soil nutrients. A similiar study with the GM bacteria Rhizbium melitoli showed that the toxins were lethal to the Monarch butterfly.
• Scientists speculate that Monsanto’s wheat will hybridize with goat grass, creating an invulnerable superweed. The manifestation of a superweed will not only make the problem of weeds worse, but it may also lead to plant invasions like that of the kutzu vine.
• There is an attempt underway to implement GM trees or “supertrees” throughout international forests which can be sprayed from the air to literally kill all surrounding life except GM trees, which are often sterile and flowerless. These GM trees are in stark contrast to the floral and fauna found in the rainforests, where a single tree can be host to thousands of unique species. This kind of engineering is often referred to as “death-engineering” rather than “life” or bio-engineering.
• Marine life is threatened by accidental release of GM fish currently under development in several countries. Trout, carp, and salmon have been shown to grow several times the normal size and growing up to six times as fast, which potentially wipe out their competitors in the wild. One accident has already happened in the Philippines, which threatens local fish supplies because there are currently no regulations for containment.
• Genetic pollution, caused by insects which are likely to pollinate organic plants and trees with transgenic elements, can reproduce itself forever in the wild, unlike chemical pollution, which eventually is dismantled or decays in the environment.
• The marketing of GM foods augments the centralization of power within the hands of giant corporations, like Monsanto. Two bioengineering firms have announced a GM vanilla plant, where vanilla can be grown at significantly lower costs. As a result, this could eliminate as many as 100,000 farmer’s jobs around the world. In fact, it is estimated that the biotech industry will find at least 14 billion dollars of substitutes for Third World farming products.
• Given the present rate of application of GM crops, in 50-100 years, organic foods may no longer be organic in composition.
• The nuaturally occuring pesticidal bacterium, bacillus thuringiensis, used as a tool to target insects and pests which feed off of crops will no longer be effective as a farming aide. Because genetically engineered Bt corn, potatoes, and cotton secrete this natural pesticide, the targeted insects and pests will grow immune to the naturally occuring pesticide. Therefore, it will be necessary to come up with stronger pesticides.

*Please note, all of these reasons were found here ( .