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carbon dioxide is a small proportion of our atmosphere . during the day, plants absorb carbon dioxide and convert it to organic carbon. during the night, some carbon is released as carbon dioxide. grazing animals transform plant carbon to animal tissue and dung. some carbon dioxide is respired. carbon transferred the soil through dead plant tops and roots (litter) and through leakage from living roots. plant litter, exudates and dung are decomposed by soil micro-organisms. carbon is converted to microbial tissue and more carbon dioxide. micro-organisms die and are consumed by other organisms to produce more microbial tissue and more carbon dioxide. carbon can be removed by harvesting plant and animal products. carbon can be removed by burning, releasing carbon dioxide into the atmosphere.

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