Increases in productivity of tropical forests , Africa and southeast Asia  have been attributed to elevated CO2  . The rates of these increases have been slowing down in the central Amazon  and Southeast Asia . In contrast, the carbon sink  in intact African forests was stable until 2010 and has only recently started to decline, indicating asynchronous carbon sink saturation in Amazonia and Africa, the difference being driven by rates of tree mortality . At the global level, Hubau et al.  argue that the carbon sink associated with intact tropical forests peaked in the 1990s and is now in decline.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report