The objective of CO₂ storage is to keep CO₂ from combustion of fossil fuels and other industrial sources away for from the atmosphere for sufficiently long time to avoid that it contribute significantly to climate change for the near and far future.

This will require that the CO₂ is stored for thousands of years. To meet this goal there is only one option that seems to have a sufficiently large capacity – underground storage in porous geological formations.

What we try to do is to store CO₂ the same way as we find oil and gas stored in the nature under sealing rocks that has retained the buoyant fluids under ground for many hundred thousand years.

Depleted oil and gas field could of course be used for CO₂ storage, but their capacity will be too small if CCS will be utilized as a major option to abate climate warming. There exists, however, an enormous storage capacity in saline aquifers. These are porous rocks filled with saline water and could be suitable for storage if that also have a sealing rock on top.

Exploration of these storage recourses can be performed by similar methods that are being used for exploring oil and gas fields: drilling exploration wells and by seismic surveys.

Their long-term performance of the aquifers can not be exactly determined by exploration and it will also be necessary to monitor the injected CO₂ underground until it has stabilized to ensure that there is no risk of leakage to the atmosphere. If risks are detected, remediation plans to prevent leakage have to be executed.