Coastal wetland and seagrass restoration projects are a carbon-removal project type within the ocean & water segment of the carbon market. They are designed to restore tidal wetlands and seagrass systems that store carbon in biomass and sediments. The carbon benefit comes from net CO2 removal into coastal biomass and sediment carbon pools. Common project configurations include Tidal wetland restoration; seagrass restoration; salt marsh restoration.

Seagrasses and tidal wetlands are ecologically valuable, but restoration success depends on site conditions that are not always easy to recreate. Blue-carbon systems can store substantial carbon in both biomass and sediments while also supporting coastal resilience, but hydrology, sediment dynamics, permanence, and community safeguards are central to quality. For buyers and program designers, the most important diligence questions are: How are hydrology, sediment dynamics, and permanence handled? Is the ecological restoration pathway well evidenced?