'Coral reefs will face very high risk at temperatures 1.5℃ of global sea surface warming .' 'Almost all coral reefs will degrade from their current state, even if global warming remains below 2°℃ , and the remaining shallow coral reef communities will differ in species composition and diversity from present reefs . This will greatly diminish the services they provide to society, such as food provision , coastal protection  and tourism .' 'The very high vulnerability of coral reefs to warming, ocean acidification, increasing storm intensity and SLR under climate change, including enhanced bioerosion , points to the importance of considering both mitigation and adaptation.'
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report