despite what you infer from the news, there isnt really THAT much CO^2 in the atmosphere, it only makes up 0.04% of the atmosphere (up from the 0.02% it should be which is causing a lot of problems). To carbonate 1 litter of soda, you would perfectly have to extract all of (and only) the CO^2 in a cube 2 meters across.
we dont have the technology to do that without chilling the entire cube down to -57°c. cooling things es expensive, expecialy when there are so many chemicals you can mix together to directlt make CO^2.
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