Blue carbon refers to carbon that is being stored in coastal and marine ecosystems. Coastal wetlands characterized by an abundance of saltmarsh, mangroves or seagrass are particularly important for sequestering carbon in the sediment and biomass. Around the country, in a diversity of these types of habitats, Sea Grant is hard at work unlocking the mysteries of these systems and how they affect the dynamics of greenhouse gases contributing to climate change. The findings of Sea Grant-supported researchers contribute to the knowledge of resource managers and other decision-makers so they can be more informed about conservation and restoration options appropriate for a changing world.