|  | | Environmental groups have campaigned against GM |
Farmers have modified their crops for thousands of years by crossing similar species. However, modern GM is controversial. Critics say the modified crops could "escape" and cross with wild plants, with unknown consequences. They also argue that more chemicals are used on some GM fields which may have a negative impact on wildlife. And while no study has found GM food to be harmful to humans, opponents say it is too soon to be sure.
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