Each RKR assessment followed a common set of guidelines  that included broad criteria for defining severity , consideration of complex risks and interactions within and across RKRs, and consideration of risks across a range of scales, regions, and ecological and human development contexts. The specific definition of severity within each RKR was determined by the author teams of that assessment, applying different combinations of key risk criteria and metrics as judged appropriate in each case. Definitions are transparent and use common criteria, but are nonetheless based on the respective author team's judgement. Conclusions about severity and associated confidence statements are therefore conditional on those definitions.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report