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Carbon dioxide is produced by all animals, plants, fungi and microorganisms during respiration and is used by plants during photosynthesis. This is to make sugars which may either be consumed again in respiration or used as the raw material for plant growth. It is, therefore, a major component of the carbon cycle.
Originally posted by bismarcksea
Aprox 1 minute for every foot squared of total space.
This is a rough estimate but close enough.