In the Amazon Forest, increases in tree mortality and a decline in the carbon sink are already reported , and old-growth Amazon Rainforest may have become a net carbon source for the period 2010-2019 . Estimates which include land use emissions indicate the region may have become a net carbon source . Fire activity is an important driver, and both bigger fires  and longer fire season  have been reported in South America, although this is strongly linked to land use and land use change as well as climate , and indeed land use change may be a stronger driver of potential loss of the Amazon Forest than climate change. The risk of climate-change-related loss of the Amazon Forest is assessed already above 'undetectable', but has only emerged over the last few years, when global warming had reached 1ºC, and is linked to land use as well as GSAT levels. Chapter 2 has assessed ecosystem carbon loss from tipping points in tropical forest and loss of Arctic permafrost, and finds a transition to moderate risk over the range 0.6-0.9ºC . Specifically, WGII AR6 Table SM2.5
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report