In a world that demands urgent action against climate change, Geological Storage of CO2 in Depleted Oil and Gas Reservoirs in Offshore Environments stands as a landmark for Brazil s energy transition. Produced by researchers from the Institute of Energy and Environment at the University of São Paulo (IEE-USP) in partnership with CNOOC Petroleum Brazil, the book presents an innovative methodological model for assessing the technical, economic, and regulatory feasibility of carbon capture and storage (CCS) projects.The case study of the Merluza and Lagosta fields, located in the Santos Basin, demonstrates that Brazil possesses the ideal geological, technological, and institutional conditions to lead the development of offshore CCS hubs. By proposing the reuse of existing oil and gas infrastructure, the work shows how scientific knowledge can transform industrial liabilities into environmental assets..