larval dispersal and evolutionary processes find limited ability to adapt this century at rates of warming at or exceeding that in RCP4.5  . For example, a global analysis  finds that increased thermal tolerance via evolution or switching to more stress-tolerant algal symbionts enable most  coral to survive through 2100 under RCP2.6, but coral-dominated communities with a historical mix of coral taxa still disappear  under RCP6.0 in simulations with adaptive mechanisms . Due to the impacts of warming, and to a lesser extent ocean acidification, global reef carbonate production is estimated to decline 71% by 2050 in SSP1-2.6, and the rate of SLR is estimated to exceed that of reef growth for 97% of reefs assessed, without adaptation by corals and their symbionts . The increased water depth due to coral loss and reef erosion, as well as reduced structural complexity, will limit wave attenuation and exacerbate the risk of flooding from SLR on reef-
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report