The climate rules ask for one physical-risk number. It hides four choices the standard leaves entirely to you.

If you report under the climate disclosure standard (IFRS S2), one line asks for the amount and share of your assets exposed to physical hazards like flood, heat, and storm. It reads as a single figure. It isn't. It's four separate decisions the rule leaves to you, and it only asks that you state which ones you made.

First, the amount of what. Vulnerable assets can be counted at book value, replacement cost, or exposure value. A property portfolio reported at replacement cost gives a very different number than the same portfolio at depreciated book value. Neither is wrong. But the choice moves the headline.

Second, a percentage of what. The same vulnerable assets can be shown against total assets, against one asset class, or against a business segment. A bank's flood-exposed mortgages might be 8% of its real estate book and 2% of total assets. Same properties, two very different signals.

Third, vulnerable under what conditions. "Vulnerable" only means something once you fix a scenario, a time horizon, a hazard, and a damage threshold. A plant that floods in a 1-in-100-year storm under a high-emissions path by 2050 may not flood under a moderate path until 2080. The scenario decides whether the asset counts at all.

Fourth, in what scope. Owned sites only, or leased ones too, supply-chain locations, financed assets? A lender disclosing every mortgage is doing something different from one disclosing only loans above a threshold.

Here is why this matters in practice. In the first wave of reporters under this standard, five of six disclosed no quantified physical-risk figure at all. Not because the hazard data was missing, but because these four choices were unresolved, and an unresolved choice is easier to leave blank than to defend.

The standard does not tell you which choice is right. It tells you to make them, disclose them, and explain why. So a defensible disclosure reads like this: 12 hazards, two scenarios, through 2050, replacement-cost basis, commercial real estate only, properties past a set inundation depth in a 1-in-100-year event. Every clause is a decision on the record.

One limit worth naming: the hazard read at a coordinate is the part a data provider gives you. The asset list, the values behind each site, the materiality cut-off, and the tie-back to your accounts are yours. That is where most of the real work sits.

If you have filed under this standard, which of the four did you find hardest to settle, and how did you land on it?

Full write-up: https://continuuiti.com/blog/ifrs-s1-and-s2/