Seven takes on AASB S2 you (maybe) haven’t heard before

You’ve surely seen the same hundred articles on S2 by now: what it is, what preparers should be doing, and why everyone needs to start early.

After several years working across S2 and TCFD, we wanted to share a few observations that feel less discussed in practice. Hopefully they are useful, a little provocative and stir up some debate. We’d be particularly interested to hear where people disagree, and what practical steps we could take to address some of the issues below.

These aren’t the only things we’re seeing, but ones that are under-discussed and carry real weight.

1. Quiet groupthink is emerging, and it risks weakening one of the main points

Across engagements, we’re seeing companies gravitate towards similar numbers, categories and prioritisation of climate-related risks and opportunities. Not because anyone has explicitly told them to, but through benchmarking, audit processes and the natural pull towards wanting to look like peers.

We’ve seen advisors, ourselves included, be guilty of this too. Benchmarking is useful as a challenge mechanism, but it becomes much more dangerous when it starts acting as a substitute for entity-specific judgement.

The risk is that a principles-based standard, explicitly designed to produce entity-specific, decision-useful disclosure, starts producing disclosures that look increasingly similar. And when everything looks similar, it becomes harder to defend a genuinely different assessment, even where the underlying exposure really is different.

A company with a different property strategy, supply chain, customer base or operating model may have a materially different climate risk profile from others in its sector. But that can get lost when peer alignment becomes the comfort blanket.

That doesn’t mean comparability is bad. It’s a core part of the ISSB architecture. But comparability should not come at the expense of what investors actually need: a clear view of how climate-related risks and opportunities affect this specific entity.

2. Recency bias isn’t just a human problem. It’s showing up in the processes themselves 

After a major weather event, attention follows. That is understandable. We’ve seen the dominant climate risk conversation shift from bushfires, to floods, to cyclones, and now to energy prices, often driven by recent events rather than what is most material over the long term.

The deeper issue is that many climate risk assessments can reinforce this bias. Too many approaches still rely on short historical baselines, backward-looking hazard data and return-period analysis applied as though hazard distributions are stationary. That’s a problem, because climate risk is not stationary.

If your model treats historical observations as a reliable proxy for future hazard distributions, it will understate tail risk and miss slow-onset or compounding events that do not show up clearly in recent data. I’ve seen stakeholders discount risks as immaterial because current figures don’t look significant, even where the future exposure profile may be very different.

Forward-looking methods exist, including ensemble climate models and non-stationary hazard analysis. At Edge, we have moved climate scenario selection earlier in our engagements to reduce this issue, but that can only go so far when risk ratings are ultimately reviewed against current data, current controls and current perceptions of materiality.

Until this improves, disclosures may be technically compliant with AASB S2 while still being anchored in assumptions that do not hold over the company’s long-term horizon, and in some cases may not hold in the near term either.

3. We are spending too much time on scenario selection and not enough on what they actually mean

A huge amount of energy goes into refining scenario narratives, debating pathways like SSP1-1.9 vs SSP1-2.6, and trying to settle what constitutes a “true” 1.5°C scenario. We have spent numerous process walkthroughs debating this point at the expense of deeper procedures on the selection and assessment of climate-related risks and opportunities. Scenario selection matters, and alignment to the standard matters. But the debate can become a distraction from the harder work that follows.

By the time organisations have settled on their scenarios, they have often left limited time to work through what those scenarios actually mean for their assets, operations, supply chains, financial performance and governance. That is where the real value sits.

For many organisations, particularly at the CRRO (climate-related risks and opportunities) identification stage, marginal differences between broadly aligned low-emissions scenarios may not change the ultimate list of material risks and opportunities as much as the quality of the downstream analysis. Beyond a certain point, precision in scenario selection matters less than the quality and depth of what comes after it.

Scenario selection still needs a defensible rationale. But the assurance and governance risk often sits in the traceability between assumptions, impacts, judgements and disclosed outcomes. Put simply: the question is not just “did we pick the right scenario?” but “did we do anything useful with it?”

4. Financial impacts need more consistency, but this will also create new pressure points

One of the reasons carbon accounting became scalable was that the GHG Protocol gave the market a common accounting architecture, even though judgement, estimation uncertainty and data quality challenges remain.

We do not yet have the same level of shared method, terminology or presentation convention for anticipated financial effects under S2. How an organisation quantifies the financial effect of a climate risk can still vary significantly between companies and advisors.

That is understandable. The standard is principles-based, and financial effects are entity-specific. But if these disclosures are going to be useful to boards, investors and auditors, some level of convergence is needed.

In Australia, the fastest path is probably pre-competitive industry collaboration on methods, assumptions and data sources for common risk types. Sectors could align on how they approach shared risks, while still leaving room for entity-specific judgement. The release of open-source climate datasets from the Australian Climate Service should also help standardise some of the underlying data.

But there is a second-order issue here. As methods mature, we expect more pressure to explain how anticipated financial effects relate to financial statement assumptions, including useful lives, impairments, provisions, capital expenditure and operating costs.

That boundary will get uncomfortable. More consistency will improve comparability, but it will also bring anticipated financial effects closer to the orbit of financial statement reconciliation and assurance. That is probably necessary. But we should be honest about where this is heading.

5. The metrics conversation is underdone, and it matters more than year one suggests

Most first-year metric discussions appear to have centred on emissions, with many also addressing targets. What is still underdeveloped is the preparation and disclosure of metrics that show how exposed or vulnerable an organisation actually is to its specific climate-related risks and opportunities, particularly at the asset or operational level.

That is partly a time pressure issue. In year one, many organisations have understandably focused on getting the core disclosure architecture in place. But metrics are what make disclosures comparable, repeatable and auditable over time. They are also what allow a board, investor or lender to track whether vulnerability to climate-related risks and alignment with opportunities is improving. A narrative can explain a risk. A metric can show whether management is doing anything about it.

This is where we expect significant uplift in year two, especially as assurance expectations expand beyond the initial areas of focus. Better metrics will also make anticipated financial effects more credible, because the connection between risk exposure, management response and financial consequence becomes clearer.

For Australian preparers specifically, the ISSB architecture places more weight on industry-based disclosures than is currently embedded in AASB S2’s mandatory requirements. That is a sequencing issue, not a design flaw, but it does leave a real gap today. If you are thinking about year two, this is one of the more practical uplift areas to get ahead of.

6. Climate resilience assessment and strategic resilience planning is immature

Significant effort has been invested in scenario analysis and climate-related risk and opportunity identification and assessment, often with substantial reliance on external consultants. Comparatively less maturity and focus has been applied to assessing the climate resilience of the company’s strategy and business model. Meaningful resilience assessment requires a deep understanding of how the business creates value, the strategic and operational levers available under different future states, and the capability to apply a robust “what if” lens across low- and high-warming scenarios. Assessments will need to evolve beyond testing existing or planned mitigations based on management’s current view of the future, toward broader and less constrained consideration of alternative strategic responses and pathways.

7. Transition plans will quietly become the centrepiece of disclosures

Even though transition plans are not mandatory under AASB S2, the strongest disclosures will increasingly use them to connect targets, strategy, capital deployment, assumptions and business resilience into a coherent decision-useful narrative.

Rather than disconnected sections on governance, risks, targets and scenario analysis, a good transition plan shows how the business plans to navigate the transition in practice, including where it will invest, what it will prioritise and how it expects its business model to remain resilient over time.  

Transition planning relies on cross-functional collaboration across strategy, finance, risk, operations, sustainability and governance teams to translate climate ambition and resilience into credible business action. Importantly, transition plans give investors and regulators greater confidence by showing the thinking, assumptions, trade-offs and actions underpinning a company’s transition pathway.

Climate disclosure is moving quickly from compliance exercise to strategic test. The organisations that get the most value from AASB S2 will be the ones willing to move beyond template responses, investigate their own assumptions and build disclosures that genuinely reflect how climate risk, resilience and transition will shape their business. There is still plenty of room for debate, and probably a few uncomfortable conversations ahead, but that is where the useful work tends to happen. If you are wrestling with these questions in practice, Edge is always up for a thoughtful conversation.