Basalt, found in volcanic areas, shows great promise for carbon dioxide storage. Given the irreversible damage caused by human activity, this project aims to re-examine architecture’s role in combating climate change. This project explores how basalt can be used in geothermal architecture to reduce CO2 emissions. Located in Iceland, where geothermal energy thrives due to two tectonic plates, the proving ground is designed to capture excess carbon dioxide discharged from the geothermal power, and solidifying them into rocks through Carbfix technology forever.