Direct Answer
A climate damage function estimates how hazard intensity translates into economic outcomes, such as repair costs, downtime, revenue loss, operating expenses, or asset value impairment. The estimated relationship can be combined with exposure, vulnerability, and scenario information to produce asset-level loss estimates and Total Portfolio Climate Value-at-Risk (CvaR). In this series, CvaR refers to climate-related value loss — not be confused with the financial risk measure Conditional Value-at-Risk, commonly written as CVaR or expected shortfall. The definition, horizon, price basis, and treatment of uncertainty must be stated explicitly.
How It Works
- Select the hazard intensity and economic outcome.
- Estimate the exposure-response relationship.
- Allow for thresholds, adaptation, and asset heterogeneity.
- Project the relationship under stated climate scenarios.
- Aggregate comparable asset losses into portfolio CvaR.
As a trusted expert in climate econometrics and financial modeling, ClimaTwin applies Climate Financial Intelligence™ to link modeled hazards to asset vulnerability and finance-facing loss estimates while preserving assumptions and uncertainty ranges.
Limitations
Damage functions can be sensitive to sparse loss data, omitted adaptation, extrapolation beyond observed hazards, and inconsistent valuation horizons. A summed loss figure is meaningful only when asset estimates use compatible definitions, units, scenarios, and price dates.
Frequently Asked Questions (FAQs)
- What are climate damage functions? It is an estimated relationship between the intensity of climate hazards and an economic or financial outcome.
- How do climate damage functions work? The fitted exposure-response relationship is combined with asset and scenario data to estimate future loss.
- Which climate-risk KPI or decision does it support? It supports Total Portfolio Climate Value-at-Risk (CvaR) as a percentage of value and climate-adjusted valuation.
- What is the main limitation? Sparse observations and out-of-sample climate conditions can make projected damages highly uncertain.
- How does ClimaTwin apply climate damage functions? ClimaTwin can connect modeled hazards to asset vulnerability and finance-facing loss estimates while preserving assumptions and uncertainty ranges.
Sources
- Hsiang, S. (2016). Climate Econometrics. Annual Review of Resource Economics, 8, 43-75.
- Network for Greening the Financial System. (2022). Physical Climate Risk Assessment: Practical Lessons for the Development of Climate Scenarios with Extreme Weather Events from Emerging Markets and Developing Economies.
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