The risk transition or 'ember' diagram illustrates the progression of socioecological risk from climate change as a function of global temperature change, taking into account the exposure and vulnerability of people and ecosystems, as assessed by literature-based expert judgement. The definitions of risk levels used to make the expert judgements are presented in Table TS.All.2 . Further details are provided in Section 16.6.3. 
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report