Mangroves occupy the interface of terrestrial, freshwater and marine environments, dominate in eight hotspots  and are connected to or integral habitats within one-third of all terrestrial and freshwater, and two-thirds of marine, hotspots . A global analysis of sediment cores from mangroves indicated that mangroves can accrete sediment at levels of sea level rise projected under low emission scenarios, but may decline at their seaward edge under high emission scenarios . However, even if this seaward erosion occurs, the expansion of mangroves inland due to sea level rise will increase carbon sequestration, because they capture carbon from seawater and freshwater runoff, in addition to photosynthesis, into their underlying sediments. If coastal management permits the expansion of mangroves inland with rising sea level, this will increase carbon sequestration because mangroves capture and preserve more carbon in their sediments than other terrestrial and marine forests and biomes  .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report