BOULDER, Colo. (CBS4) – Boulder is considering a ban on planting genetically modified food in city open space.

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On Tuesday opponents of the food, also known as genetically modified organisms (GMOs), gathered at the courthouse to share their opinions.

The city and county own some open space together and some is leased to a farmer who has planted modified corn.

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Opponents of the GMOs say the nation is watching to see what Boulder does.

“Boulder County is making a decision whether or not to allow or ban genetically modified food to be grown on our open space land,” Longmont resident Nancy Cyr said. “It’s incredibly important that we decide to not allow that. Once we go down that road there’s no turning back.”

Talk of banning the modified crops started in the late 1990s. That’s when Monsanto introduced seeds that were resistant to Round-Up weed killer.

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Boulder city and county officials are expected to discuss a possible ban as part of larger debate about open space.