Temperature affects the movement and transport of molecules and, thereby, the rates of all biochemical reactions; thus, ongoing and projected warming  that remains below an organism's physiological optimum will generally raise metabolic rates  . Beyond this optimum , metabolism typically decreases sharply, finally reaching a critical threshold  beyond which enzymes become thermally inactivated and cells undergo oxidative stress. Local and regional adaptation affect the heat tolerance thresholds of organisms. For example, organisms adapted to thermally stable environments  are often more sensitive to warming than those from thermally variable environments   . Heat tolerance also decreases with increasing organisational complexity  and is lower in eggs, embryos and spawning fish than for their larval stages or adults outside the spawning season  . By altering physiological responses, projected changes in ocean warming  will modify growth, migration, distribution, competition, survival and reproduction  .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report