The Carbon Cycle is of two types viz. Organic and Inorganic Carbon cycle. The Carbon Cycle is the interchange of CO2 in the following:
- Terrestrial biosphere, including fresh water systems and soil carbon.
- The oceans, including dissolved inorganic carbon and living and non-living marine biota,
- The sediments including fossil fuels.
The Earth’s interior, carbon from the Earth’s mantle and crust is released to the atmosphere and hydrosphere by volcanoes and geothermal systems.
Global Carbon Budget refers to the balance of the exchanges of carbon between the carbon reservoirs as shown in above graphics. This may refer to one specific pathway such as atmosphere to biosphere or vice versa or many pathways.