This interactive diagram shows how carbon moves from store to store, and the impact of human activity. The small arrows show the fluxes of carbon between different stores, with information on the average yearly movement gigatonnes* of carbon per year (GtC/yr), combining both natural and anthropogenic figures, where these are available. The larger arrows show the net human impact on the carbon cycle, and the change in store figures from the onset of industrialisation in the 1750s have been rounded to work with the Carbon budget activity.
*A gigatonne is 109 tonnes, or one billion tonnes, or 1,000,000,000 tonnes. A tonne is 1,000 kilograms. To put a gigatonne into perspective, the entire mass of humanity is estimated at just over 0.5Gt.