Physical Risk vs. Transition Risk in Financial Models
Executive Summary
Key Takeaways
- ✓ Physical risk arises from direct exposure to climate hazards, acute or chronic; transition risk arises from the economic and policy shift toward a lower-carbon state, a fundamentally different exposure channel.
- ✓ Physical risk quantification uses event-probability-and-severity methodology for acute risk and trend-based methodology for chronic risk; transition risk quantification uses scenario-based exposure across carbon pricing, demand-shift, and stranded asset channels.
- ✓ The two risk types are inversely related in timing under most scenario frameworks, an orderly, rapid transition scenario typically implies lower long-run physical risk, while a delayed transition scenario typically implies higher long-run physical risk.
- ✓ Physical and transition risk should be modelled as paired scenarios reflecting this relationship, not blended into a single climate risk figure and not treated as fully independent exposures.
Overview¶
Physical and transition climate risk are the two principal components of overall climate risk, but differ fundamentally in exposure channel, quantification methodology, and timing profile, extending the concepts covered in Physical Climate Risk Models and Transition Risk Models.
Side-by-Side Comparison¶
| Dimension | Physical Risk | Transition Risk |
|---|---|---|
| Exposure channel | Direct climate hazard disruption | Policy, regulatory, and market shift to lower-carbon state |
| Sub-types | Acute (event-driven), chronic (gradual) | Carbon pricing, demand shift, stranded assets |
| Quantification method | Event-probability-and-severity (acute); trend-based (chronic) | Scenario-based exposure across risk channels |
| Foundational input | Asset-level hazard exposure mapping | Carbon price forecast, demand and asset life assumptions |
| Timing profile | Materialises later under a delayed-transition scenario | Materialises earlier under a rapid-transition scenario |
| Mitigation lever | Physical resilience investment, relocation, redesign | Transition plan, decarbonisation investment |
Why the Two Should Be Modelled as Paired Scenarios¶
The two risk types are inversely related in timing under most scenario frameworks: an orderly, rapid transition scenario typically implies lower long-run physical risk, while a delayed transition scenario typically implies higher long-run physical risk. See Climate Scenario Analysis for how transition and physical scenarios should be paired to reflect this relationship, rather than blended into a single undifferentiated climate risk figure or treated as fully independent exposures.
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Frequently Asked Questions
What is the fundamental difference between physical and transition risk?
Physical risk arises from direct exposure to climate hazards, whether acute event-driven disruption or chronic gradual change, while transition risk arises from the economic and policy shift toward a lower-carbon state, carbon pricing, demand shifts, and stranded assets, a fundamentally different exposure channel even though both are components of overall climate risk.
How does quantification methodology differ between the two risk types?
Physical risk quantification uses event-probability-and-severity methodology for acute risk and trend-based methodology for chronic risk, both grounded in hazard exposure mapping. Transition risk quantification uses scenario-based exposure quantification across carbon pricing, demand-shift, and stranded asset channels, grounded in policy and market pathway assumptions.
How are physical and transition risk related in timing?
The two are inversely related under most scenario frameworks — an orderly, rapid transition scenario typically implies lower long-run physical risk, since aggressive near-term mitigation reduces the physical hazard severity that later materialises, while a delayed transition scenario typically implies higher long-run physical risk.
Should physical and transition risk be modelled together or separately?
As paired scenarios reflecting their inverse timing relationship, not blended into a single climate risk figure that obscures which channel is driving exposure, and not treated as fully independent exposures that ignores how the pace of transition affects the physical risk that ultimately materialises.
References
Related Articles
Physical Climate Risk Models
Building a physical climate risk model requires translating hazard exposure, whether acute event-driven or chronic gradual change, into a financial loss figure at asset or portfolio level. This guide covers asset-level hazard exposure mapping, the distinct loss estimation methodology appropriate to acute and chronic risk respectively, and how hazard data is translated into a usable financial output.
Transition Risk Models
Building a transition risk model quantifies an entity or portfolio's exposure to the policy, regulatory, and market shifts of decarbonisation, carbon pricing exposure, demand-shift exposure, and stranded asset risk, run against paired transition scenarios. This guide covers how each exposure channel should be quantified and how the resulting risk should be aggregated at portfolio level.
Climate Scenario Analysis
Climate scenario analysis is the practice of constructing multiple, internally consistent narrative and quantitative pathways, an orderly transition, a delayed transition, or continued high emissions, among others, against which a financial model's climate exposure is tested. This guide covers how scenarios are constructed from macro variables and narrative assumptions, how transition and physical scenarios should be paired rather than modelled in isolation, and how constructed scenarios feed into portfolio-level climate risk quantification.
Climate Risk Financial Models
Climate risk financial modelling quantifies physical and transition climate risk at entity or portfolio level using a defined scenario framework, distinct from adjusting a single valuation's discount rate or cash flows. This guide covers exposure mapping, scenario-based loss estimation, and how a portfolio-level climate risk model differs in scope and purpose from the single-valuation climate risk adjustment already covered elsewhere in this Knowledge Centre.