TS.C.1.4 Changes induced by climate change in the physiology, biomass, structure and extent of ecosystems will determine their future carbon storage capacity . In terrestrial ecosystems, the fertilisation effects of high atmospheric CO2 concentrations on carbon uptake will be increasingly saturated and limited by warming and drought . Increases in wildfires, tree mortality, insect pest outbreaks, peatland drying and permafrost thaw  all exacerbate self-reinforcing feedbacks between emissions from high-carbon ecosystems and warming with the potential to turn many ecosystems that are currently net carbon sinks into sources . In coastal areas beyond 1.5℃ warming, blue carbon storage by mangroves, marshes and seagrass habitats are increasingly threatened by rising sea levels and the intensity, duration and extent of marine heatwaves, as well as adaptation options  . Changes in ocean stratification are projected to reduce nutrient supply and alter the magnitude and efficiency of the biological carbon pump . 
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report