For the quality needed in food grade CO2 it is a cost issue. But lovely article that covers that exact aspect here: https://theconversation.com/co-shortage-why

For the quality needed in food grade CO2 it is a cost issue. But lovely article that covers that exact aspect here: https://theconversation.com/co-shortage-why-cant-we-just-pull-carbon-dioxide-out-of-the-air-99255 https://theconversation.com/co-shortage-why-cant-we-just-pul... [EDIT ADD] Also a nice coverage of the different grades of CO2 here: - https://www.co2meter.com/blogs/news/co2-purity-grade-oxygen-purity-grade-charts https://www.co2meter.com/blogs/news/co2-purity-grade-oxygen-...