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Plants produce CO2 as a waste product of a process called Respiration
From what I've seen there are mixed results on CO2 emissions and plant growth. They use CO2 and give off CO2 and different plants do so differently. More importantly, the technology. Imagine getting together and starting a CSA with locals using this technology. Hopefully in a few years this tech will be more affordable and more applicable for reducing negative externalities from Industrial Agriculture.