Modelling of both temperature and ocean acidification effects under future climate scenarios  suggest that some small islands will experience severe coral bleaching on an annual basis before 2040 . Above 1.5℃, globally inclusive of small islands, it is projected there will be further loss of 70-90% of reef-building corals, with 99% of corals being lost under warming of 2ºC or more above the pre-industrial period. Intact coral reefs, seagrass meadows and mangroves provide a variety of ecosystem services that are important to island communities . These include provisioning services, regulating services, cultural services and those that support community resilience . If coastal ecosystems are degraded and lost, then the benefits they provide cannot be easily replaced  .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report