This carbon cycle diagram shows the storage and annual exchange of carbon between the atmosphere, hydrosphere and geosphere in gigatons - or billions of tons - of Carbon (GtC). Burning fossil fuels by people adds about 5.5 GtC of carbon per year into the atmosphere.
<a href="//commons.wikimedia.org/wiki/User:Wong128hk" title="User:Wong128hk">J.Wong</a>
<a href="//commons.wikimedia.org/wiki/File:Carbon_cycle-cute_diagram.svg" title="File:Carbon cycle-cute diagram.svg">File:Carbon cycle-cute diagram.svg</a>