ISSB standards, IFRS S1 and S2.

The investor lens

The ISSB standards are framed differently from most sustainability reporting. The audience is explicitly investors and other capital providers, and the test for what to disclose is whether the information could reasonably affect an assessment of enterprise value. That single framing decision shapes everything else about how the disclosure is built.

It also means these disclosures are expected to connect to the financial statements: same reporting entity, same reporting period, published at the same time, and consistent in the assumptions used. Where a climate risk is described in the sustainability disclosure and an assumption in the financial statements appears to contradict it, that inconsistency is visible.

IFRS S1: general requirements

S1 sets the overall approach to disclosing sustainability-related risks and opportunities. It establishes the four-pillar structure that runs through both standards:

• Governance. The bodies and individuals responsible for oversight, how they are informed, and how they factor sustainability matters into decisions and oversight of strategy.
• Strategy. The identified risks and opportunities, their effects on the business model and value chain, and their current and anticipated financial effects.
• Risk management. The processes used to identify, assess, prioritize, and monitor these risks, and how those processes integrate with overall risk management.
• Metrics and targets. The measures used to assess performance and progress, including any targets set and how progress against them is tracked.

IFRS S2: climate

S2 applies the same structure specifically to climate. In practice this is where most of the work concentrates, because it requires quantitative disclosure that many organizations have not produced before: greenhouse gas emissions across Scope 1, 2, and 3, industry-based metrics, transition plan information where one exists, and climate resilience assessment including scenario analysis.

Scenario analysis is usually the least familiar piece. It is not a forecast. It is a structured examination of how the business would fare under different climate futures, with the reasoning documented. The value is in the reasoning being disclosed, not in the scenarios being right.

How this fits with other frameworks

ISSB is designed as a global baseline that jurisdictions build on, which means it frequently overlaps with other obligations rather than replacing them. An organization may be reporting under CSRD in Europe, California requirements in the United States, and an ISSB-based regime in another jurisdiction, all from the same underlying data.

What engagements typically cover

Gap analysis against the standards, governance and process design so the disclosures reflect something real, building the metrics and the data behind them, drafting the disclosures, and connecting the whole thing to the financial reporting calendar so it can be produced on time and reviewed properly.