It is interesting how many different fire ant "cures" there are. This one, like many, has a good thesis (environmentally sound and kills the colony with carbon dioxide) but it is highly unlikely that the quantity of carbon dioxide in the club soda would be sufficient to replace the air in a colony that may extend 12 feet in the ground. It might make the colony move since the fire ants do not like being disturbed. Find more information about home remedies at FAQ 1107, "Do any of the home remedies for eliminating imported fire ants work?" The eXtension fire ant resource area has information about safe and effective methods of fire ant control, including the Fire Ant Control Made Easy Video and the Managing Imported Fire Ants in Urban Areas Learning Lesson. You may want to try the Customized Fire Ant Management Decision Tool which will help you develop your own fire ant management plan.