Why the next test for Australian CEOs and CFOs is explaining climate risk like financial risk

Why the next test for Australian CEOs and CFOs is explaining climate risk like financial risk

For years, ESG sat awkwardly in many Australian boardrooms: important enough to mention, but too often treated as a parallel conversation to strategy, capital allocation and financial performance. That era is over.

Australia’s mandatory climate reporting regime has moved climate from the sustainability team to the centre of governance, finance and disclosure. For directors, CEOs and CFOs, the real challenge is no longer whether climate belongs in the annual reporting cycle. It is whether they can explain climate risk with the same discipline, evidence and commercial clarity they apply to any other financial risk.

This is the real reset underway in corporate Australia. The market does not need more climate aspiration dressed up as strategy. It needs boards and executives who can articulate what climate-related risks and opportunities mean for cash flows, asset values, access to finance, cost of capital and long-term competitiveness. That is also the language embedded in Australia’s reporting architecture. AASB S2 requires entities to disclose climate-related risks and opportunities that could reasonably be expected to affect cash flows, access to finance or cost of capital over the short, medium or long term.

That wording matters. It means climate disclosure in Australia is not meant to be a glossy sustainability narrative. It is intended to sit alongside the financial report as decision-useful information. The legislation has embedded a new “sustainability report” into the reporting framework, and directors must form an opinion on whether relevant climate statements and notes comply with the Act. Companies captured by the regime must also keep sustainability records supporting how those disclosures were prepared. In plain English, this is now part of the reporting spine of the business, not a marketing appendix.

That is why this moment should particularly matter to directors, CEOs and CFOs. The board is ultimately responsible for oversight. The chief executive must connect climate implications to enterprise strategy. The CFO must make sure the organisation can produce robust, controlled, auditable information. Those roles have always intersected in financial reporting.

They now intersect in climate reporting as well. ASIC ’s Regulatory Guide 280 makes clear that sustainability reporting obligations sit within the Corporations Act framework and are subject to regulator scrutiny, while Australian Institute of Company Directors ’s guidance frames the issue as a core board responsibility rather than a niche compliance exercise.

There is a hard truth here. Many organisations still talk about climate as if it were mainly an external communications issue. That is a strategic mistake. Once disclosure becomes mandatory, the central question is not, “What should we say?” It is, “What can we substantiate?” That changes behaviour. It forces management teams to examine whether their risk processes, data systems, assumptions, scenario analysis, governance structures and internal controls are strong enough to support what is being signed off. ASIC has been explicit that the regime is being phased in from financial years commencing on or after 1 January 2025 for the first cohort. For many June year-end entities, the first mandatory reporting date falls on 30 June 2026.

This is where the CFO becomes pivotal. For a long time, sustainability reporting in many businesses evolved outside the discipline of finance. Data sat across operations, procurement, property, HR and risk teams. Methodologies varied. Ownership was fragmented. But mandatory climate reporting changes the burden of proof. The CFO is not suddenly the climate scientist. Nor should they be. But the finance function is increasingly the place where assumptions are challenged, evidence is documented, controls are tested and disclosure quality is enforced. That is why climate reporting is rapidly becoming a finance transformation issue as much as an ESG issue.

“The CFO is not suddenly the climate scientist. Nor should they be.”

Directors should take note of another shift: assurance is now arriving behind disclosure. In Australia, the assurance framework for mandatory climate reporting sits under the Corporations Act, with the AUASB’s ASSA 5000 setting the general requirements for sustainability assurance engagements and ASSA 5010 setting the timeline for the phased introduction of limited and reasonable assurance. That means organisations need to think not only about what they plan to disclose, but what they can substantiate, document and ultimately assure. In practical terms, weak processes that may once have survived in voluntary ESG reporting are unlikely to hold up in a more formal reporting and assurance environment.

This has implications for how boards should behave. The old model of passively receiving a sustainability update every quarter will not cut it. Directors need to ask harder questions. What are the most material climate risks to the business model? How do those risks affect revenue, asset lives, impairment assumptions, insurance, financing or customer demand? What scenarios has management used, and why? What sits behind transition assumptions? Where are the most material judgement calls? What information is estimated, what is controlled, and what remains immature? AICD’s guidance reflects this new reality, including detailed questions for directors and a focus on liability risk, forward-looking statements and governance readiness.

The chief executive’s role is different, but no less important. CEOs have to stop treating climate as a delegated technical stream and start framing it as a business model issue. Investors, lenders and counterparties are not trying to decode whether a company is morally committed to sustainability. They are trying to assess whether management understands transition risk, physical risk, capital expenditure implications, resilience and opportunity. A credible chief executive will be able to explain, in plain commercial terms, how climate is changing the economics of the business and what management is doing about it. Australia’s standard is designed around this lens: governance, strategy, risk management, metrics and targets.

There is also a broader market reason this matters. Even where companies are not in the first reporting cohort, the reporting burden is already cascading through supply chains, lenders and procurement processes. ASIC and the AASB have both acknowledged the practical challenge for smaller companies getting ready, and AICD notes that organisations outside the initial mandatory perimeter may still face information requests because larger entities must report across the value chain. In other words, directors and CFOs who think this can be ignored because their entity is not yet directly captured are reading the landscape badly.

“The temptation, of course, is to reduce all this to compliance. That would be another mistake.”

The temptation, of course, is to reduce all this to compliance. That would be another mistake. Yes, the immediate pressure is regulatory. Yes, the sign-off obligations are real. Yes, greenwashing and disclosure quality remain live concerns for regulators. But the bigger issue is competitive credibility. The companies that handle this well will be the ones that can show they understand where risk is rising, where capital needs are changing, where resilience must be built and where strategic advantage may emerge. Those that treat climate disclosure as a narrow reporting burden will likely produce documents that satisfy neither the regulator nor the market.

That is why the best Australian boards will not ask whether climate reporting is an ESG issue. They will ask whether the organisation’s governance, finance and strategy functions are integrated enough to tell a coherent story about risk and value creation. The strongest CEOs will not outsource the narrative. The strongest CFOs will not treat the numbers as someone else’s problem until year-end. And the strongest directors will not accept vague comfort when the issue now sits inside the formal reporting and assurance architecture of the business.

In the end, this is the simplest way to understand the new environment. Climate has entered the corporate mainstream not because the language has changed, but because the discipline has. Australian companies are being asked to explain climate-related risk and opportunity the way markets expect any serious business issue to be explained: with governance, evidence, judgement and financial consequence. For directors, CEOs and CFOs, that is not a communications exercise. It is now part of the job.

About the author
Geoff Gourley is an Australian business leader, founder and CEO, and adviser working across ESG, social impact, sustainability, responsible business and AI-enabled transformation. He is known for helping organisations connect commercial performance with environmental and social outcomes, and for bringing a practical, board-level perspective to emerging shifts in governance, disclosure and strategy.

Contact: geoff.gourley@esgandi.com.au

Appendix: key references and terms

AASB S2 Climate-related Disclosures: The Australian climate disclosure standard issued by the Australian Accounting Standards Board. It requires disclosure of climate-related risks and opportunities that could reasonably be expected to affect an entity’s cash flows, access to finance or cost of capital over the short, medium or long term.

AASB: The Australian Accounting Standards Board, which develops Australian accounting and sustainability reporting standards.

ASIC: The Australian Securities and Investments Commission, Australia’s corporate regulator. ASIC has issued guidance and FAQs on sustainability reporting and associated assurance requirements.

ASSA 5000: The Australian standard titled General Requirements for Sustainability

Assurance Engagements. It sets the overarching assurance requirements for sustainability assurance engagements in Australia.

ASSA 5010: The Australian standard titled Timeline for Audits and Reviews of Information in

Sustainability Reports under the Corporations Act 2001. It sets the phasing and scope of assurance for sustainability reports prepared under the Act.

AUASB: The Auditing and Assurance Standards Board, the independent Australian Government body responsible for developing and issuing auditing and assurance standards.

Corporations Act 2001: The principal legislation underpinning Australia’s mandatory sustainability reporting and assurance framework, including the requirement for assurance to be applied in accordance with AUASB standards.

Limited assurance: A lower level of assurance than reasonable assurance. It is commonly framed around whether anything has come to the assurer’s attention that causes them to believe the subject matter is materially misstated. Under Australia’s climate reporting regime, assurance is phased in starting with limited assurance for relevant parts of the sustainability report.

Reasonable assurance: A higher level of assurance, closer in nature to the level associated with a financial statement audit, though not identical in every respect. Under the Australian phase-in model, some disclosures move toward reasonable assurance over time.

Mandatory climate reporting: Australia’s new statutory climate disclosure regime applying to entities that meet the relevant thresholds under the Corporations Act, phased in from financial years beginning on or after 1 January 2025.