All tidal wetlands are blue carbon ecosystems. Tidal wetlands, including those classified as supratidal, transitional, or estuarine, have significant potential for carbon sequestration and emission reduction, comparable to or exceeding that of mangroves, saltmarshes, and seagrasses. These wetlands are influenced by tides and are characterized by long-term carbon storage, low greenhouse gas (GHG) emissions, and the ability to be managed to enhance carbon stocks. They are bounded by the highest tidal inundation levels at the terrestrial edge and the photic zone at the marine edge. Tidal wetlands include forested wetlands, shrublands, grasslands, and microalgal mats, excluding temporary carbon storage systems like macroalgal beds and ancient peat formations. Tidal wetlands are distributed along inundation and salinity gradients, with different ecosystems occurring at varying elevations. They are influenced by tides, with soils directly flooded by high tides or indirectly affected by ocean waves or marine spray. These wetlands support biodiversity, with many hosting endangered species. They have high carbon stocks, with some areas storing up to 800 Mg of carbon per hectare in belowground stocks. Tidal wetlands in Indonesia, Australia, the United States, and South Africa have been identified as significant blue carbon ecosystems. Tidal wetlands have long-term storage of fixed carbon dioxide and can sequester carbon at rates comparable to or exceeding those of traditional blue carbon ecosystems. They have lower methane emissions due to marine sulphate deposits and anaerobic conditions, making them effective carbon sinks. However, they can also be sources of GHG emissions, particularly through tree roots and stems. Tidal wetlands are also important for lateral carbon movements, with carbon exported to adjacent water bodies. Tidal wetlands have been heavily impacted by anthropogenic activities, including deforestation, agriculture, and climate change. In Australia, many Melaleuca and Casuarina forests have been converted to agricultural land, leading to biodiversity loss and carbon sink degradation. Similar losses have occurred in the United States, South Africa, and Southeast Asia. Conservation and restoration efforts are essential to protect these ecosystems, which provide multiple benefits, including carbon sequestration, biodiversity conservation, and climate adaptation. Management of tidal wetlands is practical and possible through conservation and restoration. These efforts include protecting wetlands, restoring hydrological conditions, and managing invasive species. Carbon offset projects can help restore tidal wetlands, providing economic incentives for landholders. However, challenges include balancing ecological and social needs, ensuring effective management, and addressing political and regulatory barriers. Despite these challenges, tidal wetlands have significant potential to contribute to global carbon mitigation and climate adaptation strategies.All tidal wetlands are blue carbon ecosystems. Tidal wetlands, including those classified as supratidal, transitional, or estuarine, have significant potential for carbon sequestration and emission reduction, comparable to or exceeding that of mangroves, saltmarshes, and seagrasses. These wetlands are influenced by tides and are characterized by long-term carbon storage, low greenhouse gas (GHG) emissions, and the ability to be managed to enhance carbon stocks. They are bounded by the highest tidal inundation levels at the terrestrial edge and the photic zone at the marine edge. Tidal wetlands include forested wetlands, shrublands, grasslands, and microalgal mats, excluding temporary carbon storage systems like macroalgal beds and ancient peat formations. Tidal wetlands are distributed along inundation and salinity gradients, with different ecosystems occurring at varying elevations. They are influenced by tides, with soils directly flooded by high tides or indirectly affected by ocean waves or marine spray. These wetlands support biodiversity, with many hosting endangered species. They have high carbon stocks, with some areas storing up to 800 Mg of carbon per hectare in belowground stocks. Tidal wetlands in Indonesia, Australia, the United States, and South Africa have been identified as significant blue carbon ecosystems. Tidal wetlands have long-term storage of fixed carbon dioxide and can sequester carbon at rates comparable to or exceeding those of traditional blue carbon ecosystems. They have lower methane emissions due to marine sulphate deposits and anaerobic conditions, making them effective carbon sinks. However, they can also be sources of GHG emissions, particularly through tree roots and stems. Tidal wetlands are also important for lateral carbon movements, with carbon exported to adjacent water bodies. Tidal wetlands have been heavily impacted by anthropogenic activities, including deforestation, agriculture, and climate change. In Australia, many Melaleuca and Casuarina forests have been converted to agricultural land, leading to biodiversity loss and carbon sink degradation. Similar losses have occurred in the United States, South Africa, and Southeast Asia. Conservation and restoration efforts are essential to protect these ecosystems, which provide multiple benefits, including carbon sequestration, biodiversity conservation, and climate adaptation. Management of tidal wetlands is practical and possible through conservation and restoration. These efforts include protecting wetlands, restoring hydrological conditions, and managing invasive species. Carbon offset projects can help restore tidal wetlands, providing economic incentives for landholders. However, challenges include balancing ecological and social needs, ensuring effective management, and addressing political and regulatory barriers. Despite these challenges, tidal wetlands have significant potential to contribute to global carbon mitigation and climate adaptation strategies.