Carbonated water doesn't do anything to the ground or grass, and is not explosive in nature. Carbon dioxide, being heavier than air will, so they say, suffocate the ants, the same way dry ice in airtight room will suffocate a person.
Edited to add: Snopes has an article about the carbon dioxide method--they say it ain't so. Just goes to show you what you read in the newspaper ain't always right.
Edited to add: Snopes has an article about the carbon dioxide method--they say it ain't so. Just goes to show you what you read in the newspaper ain't always right.
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