Image:Carbon cycle-cute diagram.jpeg
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This carbon cycle diagram shows the storage and yearly changes of the carbon between the atmosphere, hydrosphere and geosphere in Gigatons - or billion tons - of Carbon (GtC). Humanity adds about 5.5 billion tons of carbon dioxide per year, most of which goes directly into the atmosphere.
From http://earthobservatory.nasa.gov/Library/CarbonCycle/carbon_cycle4.html
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