Climate Scenario Analysis: A One-Line Board Message
A general insurer's board is reviewing its climate risk position ahead of the January reinsurance renewal. The insurer writes £800m of property premium, of which 35% is in UK flood-exposed postcodes. A scenario analysis using three IPCC-aligned pathways shows that under a 'no transition, high warming' scenario, the 1-in-100-year flood loss could rise from £210m to £340m by 2050. The model has wide uncertainty and does not capture recent changes in planning policy. The reinsurance broker has offered a renewal at a 12% higher cost with a lower attachment point, which would reduce net exposure but increase the expense ratio by 1.8 percentage points. The CFO wants a one-page summary stating that the insurer is 'adequately protected'. The chief risk officer wants a fuller scenario analysis. The board meets in three weeks.
1. How should the actuary respond to the CFO's request for a one-line 'adequately protected' statement?
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Response. I cannot provide a one-line statement that the insurer is 'adequately protected' because the analysis does not support that conclusion without qualification. The scenario range is wide, the model omits planning-policy changes, and the reinsurance decision is not yet made.
Alternative. Offer a one-page summary that states the position accurately: 'The insurer's net flood exposure is within appetite under the central scenario, but the high-warming scenario and model limitations mean the board should consider the proposed reinsurance renewal and further data improvements.' That gives the CFO a short, usable message without misrepresenting the analysis.
Professional integrity. If the CFO insists on the original wording, explain that it could mislead the board and breach professional standards. Document the request and escalate if necessary. A short statement can still be decisive if it is honest.
2. What should the board paper include to communicate the climate scenario results and support the reinsurance decision?
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Board paper. (1) Purpose and decision required. (2) Current exposure: £800m premium, 35% flood-exposed, 1-in-100 loss £210m. (3) Scenario results across the three pathways, with the £210m-£340m range by 2050. (4) Model limitations and what is not captured. (5) Reinsurance options: current cover, proposed renewal at 12% higher cost with a lower attachment and a 1.8-point expense-ratio increase, and alternatives such as parametric cover or reduced line size. (6) Net exposure and capital impact of each option. (7) Recommendation: accept the renewal if it keeps net exposure within risk appetite, while commissioning improved data and monitoring planning-policy changes. (8) Next steps and review date.
Communication. Use ranges, not point estimates. Distinguish what is known, what is modelled and what is judgement. Make clear that 'adequately protected' is a decision for the board, not a statement the actuary can make unilaterally.
3. How should the actuary handle the model limitations and the disagreement between the CFO and the CRO?
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Model limitations. Acknowledge them openly: the model does not capture planning-policy changes, the scenario probabilities are not precise, and the loss estimates have wide confidence intervals. Explain how the limitations affect the conclusion: they increase the chance that losses are higher than modelled, which supports buying more protection, not less.
Disagreement. The CFO and CRO are not necessarily in conflict: the CFO wants a clear message, the CRO wants completeness. Reconcile them by giving a clear recommendation with conditions. Recommend the reinsurance renewal because it reduces tail exposure and is robust across scenarios, even though it costs 1.8 points. Set a trigger to review if flood losses or planning-policy changes indicate higher risk.
Process. Present both views in the paper and explain why the recommendation holds. If the board wants to decline the renewal, state the risk explicitly. The actuary's role is to inform the decision, not to force consensus.