However, CCS implementation remains limited worldwide. There is little proven track record of safely storing CO₂ over the long term. (…) Significant questions remain regarding the ability to safely contain CO₂ for decades to centuries.

This article introduces the incident of CO₂ leakage from an underground storage at the Illinois Basin – Decatur Project (IBDP) that occurred in Illinois, USA, in 2024 and outlines key points to be considered when evaluating the safety of CCS projects in Japan.