As climate change intensifies, policymakers urgently need reliable tools to identify who and what locations are most at risk. Risk indices aim to meet this demand by translating complex, multidimensional realities into accessible, comparative scores. In principle, they can support evidence-based decisions: targeting adaptation finance, prioritizing hotspots, and tracking progress.
Yet today’s landscape is fragmented: indices differ in how they define exposure, vulnerability, and risk, in the data they draw on, and in how they combine indicators into a single score. Some prioritize global comparability; others focus on local realities. Most cite the Intergovernmental Panel on Climate Change (IPCC) as a conceptual anchor, but alignment with successive IPCC frameworks varies considerably. As a result, indices are often hard to compare, replicate, or apply across contexts.
This brief helps navigate this complex terrain. We examine how climate-related risk indices conceptualize and operationalize their key components, assess what these differences mean for comparability and policy relevance, and outline ways forward. We highlight selected indices to illustrate key points, without aiming to provide an exhaustive overview of all existing metrics. Particular attention is given to the subnational level, where the need for targeted, context-sensitive tools is most acute.