Genetically modified organisms in agriculture have been a source of controversy since their introduction in the mid-1990s. On the one hand, the planting of GM varieties has spread rapidly. In the case of soybeans, more than 70 percent of total acreage used for their cultivation is of some type of GM variety. However, GM varieties have not been adopted in major crops like wheat, rice and potatoes, and are banned in the European Union and most African countries. There has been continuous debate over the regulation of GM varieties, and California voters now face a proposition that will require the labeling of food that contains genetically modified ingredients.
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