Substantial climate change-driven impacts on tropical tree cover and vegetation type are projected in all studies, irrespective of whether or not the degree amounts to a forest "dieback"   . Accordingly, models also suggest a continuation of tropical forests acting as carbon sinks . A recent study combining field plot data with statistical models  indicates that, in the Amazonian and possibly also in the African forest, the carbon sink in above-ground biomass already declined in the three decades up to 2015. This trend is distinct in the Amazon whereas data from Africa suggests a possible decline after 2010. The authors estimate the vegetation carbon sink in 2030-2040 to decline to zero+0.205 PgC yr1 in the Amazon and to 0.26+0.215 PgC yr1 in Africa . Their results suggest that, over time, CO2 fertilisation is outweighed by the impacts of higher temperatures and drought that enhance tree mortality and diminish growth. The degree of thermal resilience of tropical forests is still uncertain, however .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report