In the process of photosynthesis, cucumbers grown in greenhouses absorb 1 kg of carbon dioxide while producing 7 kg

In the process of photosynthesis, cucumbers grown in greenhouses absorb 1 kg of carbon dioxide while producing 7 kg of fruit. How many kg of carbon dioxide will it take to get 300 kg of cucumbers? How can you increase the carbon dioxide content in greenhouse air?

Approximately 43 kg in a greenhouse is possible, but there a person will not be able to stay in the air, only 0.03% of carbon dioxide; when increasing, a person will suffocate, and when lowering, a person will not be able to exhale, because there will be nothing to exhale.