To encompass the nature of climate risk, IPCC assessment since the Third Assessment Report has used five overarching domains, named 'reasons for concern', to assess increasing risk for societies and ecosystems under climate change . The reasons for concern approach has enabled evidence to be combined with expert judgement, in order to provide a holistic assessment across multiple lines of evidence . The approach also respects the uncertainties inherent to climate risk and highlights the ways in which values are relevant in connecting scientific knowledge to societal decision making and risk management. The different reasons for concern underscore that there is no single metric that can reflect all dimensions of climate-related risk and the diversity of consequences for lives and livelihoods, health and well-being, economic and sociocultural assets, infrastructure and ecosystems .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report