This <a href="https://en.wikipedia.org/wiki/carbon_cycle" class="extiw" title="en:carbon cycle">carbon cycle</a> diagram shows the storage and annual exchange of carbon between the <a href="https://en.wikipedia.org/wiki/Earth%27s_atmosphere" class="extiw" title="en:Earth's atmosphere">atmosphere</a>, <a href="https://en.wikipedia.org/wiki/hydrosphere" class="extiw" title="en:hydrosphere">hydrosphere</a> and <a href="https://en.wikipedia.org/wiki/geosphere" class="extiw" title="en:geosphere">geosphere</a> in gigatons - or billions of tons - of Carbon (GtC). Burning fossil fuels by people adds about 5.5 GtC of <a href="https://en.wikipedia.org/wiki/carbon" class="extiw" title="en:carbon">carbon</a> per year into the atmosphere.
User <a href="https://en.wikipedia.org/wiki/User:Kevin_Lafamiglia" class="extiw" title="en:User:Kevin Lafamiglia">Kevin Saff</a> on <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a>
<a rel="nofollow" class="external free" href="https://earthobservatory.nasa.gov/features/CarbonCycle">https://earthobservatory.nasa.gov/features/CarbonCycle</a>