The IAEA Marine Environment Laboratories actively support Blue Carbon initiatives, focusing on mangroves, seagrasses, and saltmarshes, which are coastal ecosystems that capture and store carbon, mitigate climate change, and support biodiversity. Through nuclear and isotopic techniques, the IAEA helps countries assess carbon stocks and sequestration rates, generating robust, science-based data. These efforts inform national policies, coastal management, and restoration projects, while highlighting ecosystem services and enabling innovative financing mechanisms such as carbon markets. By fostering global collaboration, sharing best practices, and engaging stakeholders, the IAEA promotes sustainable development, climate resilience, and international reporting under frameworks like the UNFCCC and the Sustainable Development Goals.