Carbon sequestration is the process of capture and long-term storage of atmospheric carbon dioxide (CO2)and may refer specifically to:

1. The process of removing carbon from the atmosphere and depositing it in a reservoir."[1] When carried out deliberately, this may also be referred to as carbon dioxide removal, which is a form of geoengineering.

2. The process of carbon capture and storage, where carbon dioxide is removed from flue gases, such as on power stations, before being stored in underground reservoirs.

3. Natural biogeochemical cycling of carbon between the atmosphere and reservoirs, such as by chemical weathering of rocks.