**8. Conclusions**

In summary it is clear that dissolution trapping is a potential solution for storing large quantities of anthropogenic CO2 thereby reducing carbon emissions. More research is required, especially field testing with integrated monitoring to check how the CO2 behaves under realistic injection and reservoir conditions in the medium-to-long term. The major advantages of dissolution trapping are that very substantial amounts of CO2 can be stored very safely. The risk is that CO2 dissolves too slowly so that a significant part of CO2 is still in a mobile separate supercritical phase (separated from the brine phase) which is buoyant and could escape to the surface. There are however two other CCS mechanisms, structural and residual trapping which prevent or at least reduce the CO2 leakage risk. It must also be guaranteed that no drinkable-water aquifers are contaminated with CO2 or any harmful species mobilized by CO2 injection (e.g. dissolution of heavy metal ions by the acidic brine generated), which may then be transported into drinking water reservoirs.
