The treepods contain an alkaline resin (a base.) When air is filtered through this resin, the CO2 (an acid) reacts with the the resin, storing it. This resin can hold the CO2 until it reacts with water, releasing the CO2. Thus, the envisioned usage would be to take CO2 from the air using the resin, then release it into some type of storage tank. As of now, humans are unable to convert CO2 to usable energy, but there are many scientist trying to figure out how to do just that. However, as of right now, I don't think there is a good answer for what to do with the CO2.
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