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Iceland is the largest landmass found above sea level at the mid-ocean ridges, about 103,000 km 2 mostly made of basaltic rocks (∼90%). Theoretically much of Iceland could be used for injection of CO 2 , fully dissolved in water. Most of the pore space in the older rocks is filled with secondary minerals, thus the young and porous basaltic formations, found within the active rift zone and covering about one third of Iceland, are the most feasible for carbon storage onshore. Studies on mineral storage of CO 2 in basaltic rocks are still at an early stage. Therefore, natural analogues are important for gaining a better understanding of CO 2 fixation in basaltic rocks. Volcanic geothermal systems serve as an applicable analogue since the systems receive considerable amounts of CO 2 from magma in the roots of the systems. Wiese et al. [1] quantified the amount and spatial distribution of CO 2 stored as calcite within the bedrock of three active geothermal systems in Iceland. The results from this study reveal a large storage potential of basaltic rocks and can be used as a guideline for the theoretical potential of CO 2 storage in basaltic formations. The largest storage potential lies offshore, with long-term advantages for safe and secure CO 2 storage in the mid-ocean ridges. The theoretical mineral CO 2 storage capacity of the ocean ridges, using the Icelandic analogue, is orders of magnitude larger than the anticipated release of CO 2 caused by burning of all fossil fuel on Earth.