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How much oxygen released by trees?

Asked by 9doomedtodie (3113points) April 19th, 2010

Today, the population of human being is growing on & on.In day time the trees release O2 & Human being release CO2 vice versa.What is the percentage of O2 released by trees compared to CO2 released by human being?

Does it depend on size,shape,age,type of tree?

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