Climate change is a key agent of biodiversity change in numerous ocean and coastal ecosystems  , and climate change and biodiversity loss reinforce each other . Biodiversity has changed in association with ocean warming and loss of sea ice , SLR , coral bleaching , MHWs  and upwelling changes  . Overlapping non-climate drivers  also decrease ocean and coastal ecosystem biodiversity  . There is medium confidence that local and regional marine biodiversity losses from climate disrupt ecosystem services provided by specific ocean and coastal species or places . However, adaptive capacity varies greatly among ecosystems, and ecological functions sometimes remain, despite changes in species assemblages, as in certain coral reef communities . Projected changes in biodiversity due to climate change  are expected to alter the flow and array of ocean and coastal ecosystem services  , but data gaps hinder developing projections of ecosystem service changes detailed enough to support decision making .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report