'Seagrass meadows   will face moderate to high risk at temperature above 1.5°C global sea surface warming.' 'The transition from undetectable to moderate risk in salt marshes  takes place between 0.7°C-1.2°C of global sea surface warming , and between 0.9°C-1.8°C  in sandy beaches, estuaries and mangrove forests.' 'The ecosystems at moderate to high risk under future emission scenarios are mangrove forests , estuaries and sandy beaches  and salt marshes  .' 'Global coastal wetlands will lose between 20-90% of their area depending on emissions scenario with impacts on their contributions to carbon sequestration and coastal protection .' Estuarine wetlands will remain resilient to modest rates of SLR where their sediment dynamics are unconstrained. But SLR and warming are projected to drive global loss of up to 90% of vegetated wetlands by the end of the century under the RCP8.5 , especially if landward migration and sediment supply are limited by human modification of shorelines and river flows . 'Moreover, pervasive coastal squeeze and human-driven habitat deterioration will reduce the natural capacity of these ecosystems to adapt to climate impacts .'
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report