Energy gas geo-storage is crucial for achieving a sustainable future, as it helps to reduce CO2 emissions and facilitates the provision of large-scale renewable energy. However, a persistent gap exists between small-scale theoretical advances and large-scale practical implementation. This session brings together research on geological storage of CO2, hydrogen, natural gas and other fluids across molecular, pore, reservoir and field scales. Contributions will address fundamental mechanisms, innovative experimental and modelling approaches. Particular emphasis will be placed on technologies and strategies to translate laboratory findings to field-scale implementations. By integrating insights across scales, this session aims to explore pathways for advancing geo-storage toward gigaton-scale deployment, thereby supporting energy security and global climate goals.