Bond, 2015; Knorr et al., 2016a). As a consequence, enhanced woody cover is expected to occur in the future, especially in mesic savannas, while in xeric savannas an increase in woody cover would occur in regions with enhanced precipitation . Even though semiarid regions have dominated the global trend in land CO2 uptake in recent decades , so far, most studies that investigated future climate change impacts on savanna ecosystems have concentrated on changes in the extent of land area affected  rather than on carbon cycling, with medium confidence for increasing woody cover:grass ratios . Increases in woody vegetation in what is now grass-dominated would possibly come with a carbon benefit, for instance, it was found that a broad range of future climate and CO2 changes would enhance vegetation carbon storage on Australian savannas . Results from a number of field experiments indicate, however, that impacts on total ecosystem carbon storage may be smaller due to a loss in below-ground carbon . Nunez et al.  critique existing incentives to promote the invasion of non-native trees into treeless areas as a means of carbon sequestration, raising doubts about the effects on fire, albedo, biodiversity and water yield .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report