Direct air capture (DAC) uses large fans to pull ambient air over filters that capture carbon dioxide. This highly concentrated carbon dioxide can then be stored to produce negative emissions, which is called direct air capture and storage (DACS).
Storage can be pumping the gas underground into empty caverns however these need to be monitored to make sure the CO₂ does not leak back into the atmosphere. An alternative way is to pump CO₂ into basalt rock where it naturally reacts, turning into solid stone - naturally stable this does not need any long-term monitoring.
