Climate risk is no longer an environmental concept. It is a financial, legal and strategic one, and Australian businesses are now expected to understand it deeply. 

For many Australian businesses, the term “climate risk” has historically felt like something that belonged in a government policy document or an environmental impact assessment. That is changing rapidly. Under Australia’s evolving sustainability reporting landscape, climate risk is now squarely a boardroom issue, one that directors are legally expected to identify, assess and disclose. 

But what does climate risk actually mean in practice? And how are businesses supposed to measure something that is, by its nature, deeply uncertain? This article breaks down the fundamentals. 

At its simplest, climate risk refers to the potential for climate change to negatively affect a business, its operations, assets, revenues, costs or reputation.  

The Australian Sustainability Reporting Standards (ASRS), aligned with the International Sustainability Standards Board (ISSB) framework, recognise two broad categories of climate risk. 

The first is physical risk. This captures the direct impacts of a changing climate on the physical world. Acute physical risks are event-driven, such as a cyclone damaging a port facility in Queensland, a flood disrupting supply chains or a heatwave reducing agricultural yields. Chronic physical risks are longer-term and gradual, including rising sea levels threatening coastal infrastructure, increasing average temperatures reducing worker productivity outdoors or shifting rainfall patterns affecting water availability for farming and mining operations. 

The second is transition risk. As Australia and the global economy move toward net zero, businesses face risks from the policy, technology and market changes that come with that shift. New carbon regulations, rising energy costs, changes in consumer preferences or stranded assets, such as fossil fuel reserves that become uneconomic to extract, all fall under transition risk. For export-oriented Australian industries, the growing adoption of carbon border adjustment mechanisms by trading partners like the European Union adds another layer of transition exposure. 

A third category, liability risk, sits across both. This captures the legal and reputational consequences of failing to adequately assess, manage or disclose climate-related risks. ASIC has made clear that this is an active enforcement concern in Australia. 

Not every climate risk is relevant to every business. Materiality is the process of determining which risks are significant enough to warrant disclosure and management attention. Under AASB S2, a climate-related risk is considered material if it could reasonably be expected to influence the decisions of investors, lenders or other users of financial reports. 

A materiality assessment typically involves identifying the full range of potential climate risks facing a business, then evaluating each one against two dimensions: the likelihood of it occurring and the magnitude of its potential impact on the business. Risks that score highly on both dimensions are considered material and must be disclosed. 

For an Australian agribusiness, prolonged drought and shifting rainfall patterns are likely to be highly material. For a financial institution with a large property lending book, rising flood risk in coastal and riverine areas may be the key concern. For a resources company, the risk of stranded assets and tightening export market requirements around emissions intensity may dominate the materiality picture. 

Getting materiality right matters because it shapes what a business must report, how it allocates risk management resources and what it communicates to investors. Underestimating materiality is not just a reporting failure. Under Australia’s mandatory disclosure regime, it can constitute misleading conduct. 

Once material risks are identified, the next step is understanding how those risks might actually play out. That is where scenario analysis comes in. 

Think of it less as predicting the future and more as stress-testing the business. Scenario analysis asks: how would we perform if the world warms by 1.5 degrees? What about 3 degrees? Each future looks very different, and the risks that dominate in each one are different too. 

Under AASB S2, businesses are required to model at least two contrasting scenarios. In a low-warming world, rapid decarbonisation is the norm. Transition risks intensify as policy tightens and markets shift away from carbon-heavy products and services. In a high-warming world, physical risks take centre stage. More frequent extreme weather events, prolonged droughts and rising sea levels become the primary concern.

The analysis also considers timeframes. Short-term risks typically sit within a five-year horizon. Medium-term risks extend to around 2030, aligned with major policy milestones. Long-term risks can stretch to 2050 and beyond, which is especially relevant for assets like infrastructure, farmland and resource projects that are built to last decades. 

The goal is not a precise forecast. It is an honest picture of where the business is most exposed and under what conditions. That picture is what informs strategy, investment decisions and ultimately what gets disclosed to the market. 

Scenario analysis does not predict what will happen. It prepares a business for a range of futures — and that preparation is the point. 

Once the scenarios are built, the next challenge is putting numbers to them. This is where many organisations find the process most difficult, and for good reason. 

There is currently no single standardised method for translating climate scenarios into financial figures. The data needed to do it well is often incomplete or inconsistent. And the modelling itself requires a level of technical expertise that most businesses do not have in-house. As a result, quantifying climate risk tends to be the most time-consuming and costly part of the entire disclosure process. 

In practice, it involves two main workstreams.  

Quantifying physical risk might mean modelling the likelihood and financial cost of, say, flood damage to a key facility over a 20-year period under different warming scenarios. Quantifying transition risk might mean estimating how a future carbon price would affect operating costs, or what a shift in market demand could mean for asset values. 

AASB S2 does not expect perfection. What it does expect is a genuine effort: reasonable assumptions, clearly disclosed methodologies and transparency about where uncertainty remains. Regulators and investors are not looking for false precision. They are looking for evidence that a business has engaged with the question seriously. 

For businesses building this capability for the first time, there are practical places to start. 

Climate risk is a broad, complex and still-evolving field. But the expectation on Australian businesses is clear: identify what is material, assess it honestly across different future scenarios and disclose it in a way that gives investors and stakeholders a genuine picture of exposure. That is not a small ask — but it is a necessary one.