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2 answer(s)

Reply	connick says: Humans don't exhale CO2 because they "only use so much", we exhale CO2 because for the most part it is toxic to us. Knowing the amount of CO2 exhaled by humans would not provide a good indicator of how much CO2 is absorbed by plants. All plants vary in absorption rates of nutrients. Aside from directly measuring the amount of CO2 present in an environment before and after the introduction of a plant, I can't think of a reasonable way to deduce their consumption from the amount which humans exhale.  (1 vote) average rating:1 Tags: unanswered, plants, environment.
	posted on 2010-02-08 20:48:52 | Report abuse

Reply	MikeAdams#367 says: I don't think there is a single answer: it will vary with species, light intensity, water availability and overall growth conditions. Having said that, most plants will show a significant increase in growth rate if CO2 levels are increased, suggesting that CO2 was the limiting factor. Most plants are very efficient in their use of CO2 and may use almost all that is available in the leaves themselves.   (no votes) Tags: unanswered, plants, environment.
	posted on 2010-04-06 14:29:15 | Report abuse