Carbon Accounting: Why Scope 1, 2 and 3 Emissions Matter More Than Ever for Australian Business

Carbon accounting has shifted from being a “nice to have” sustainability exercise to a core business capability.

For Australian businesses, the pressure is now coming from multiple directions at once: regulation, customer expectations, supply chain demands, investor scrutiny and tender requirements. And with the rollout of Australia’s new climate disclosure regime, getting a proper handle on emissions is no longer something businesses can keep pushing down the list. Certain entities are now required to report under AASB S2 Climate-related Disclosures, while AASB S1 is available as the voluntary general sustainability reporting standard. The AASB states that AASB S2 is the mandatory climate standard for certain entities under the Corporations Act, while AASB S1 is voluntary.

At the centre of this is carbon accounting.

Put simply, carbon accounting is the process of measuring and managing your greenhouse gas emissions. For most businesses, this means understanding emissions across Scope 1, Scope 2 and Scope 3.

Scope 1 covers direct emissions from sources your business owns or controls. Think fuel burned on site, company vehicles, gas use, industrial processes or refrigerant leaks.

Scope 2 covers indirect emissions from the electricity, steam, heating or cooling your business purchases and consumes.

Scope 3 covers the rest of the value chain — both upstream and downstream — including purchased goods and services, transport, waste, business travel, employee commuting, investments, and the use of sold products.

These categories are grounded in the GHG Protocol, which remains the most widely used global framework for greenhouse gas accounting.

This matters because most businesses have historically focused on what is easiest to measure first: Scope 1 and Scope 2. That makes sense. They are usually more visible, more controllable and supported by cleaner internal data such as fuel invoices, electricity bills and meter records. Scope 3 is often far larger, but it is also more complex because it sits across suppliers, procurement categories, logistics, travel, waste and customer use patterns. The GHG Protocol’s Scope 3 standard was developed specifically to help organisations account for these wider value chain emissions.

For many businesses, the smartest path is to start with Scope 1 and Scope 2 first, build a credible baseline, get governance and methodology right, and then move into Scope 3 in a staged, practical way.

That approach is commercially sensible.

Why? Because a business that cannot confidently measure its own direct operations will struggle to credibly estimate emissions buried across a complex supply chain. Starting with Scope 1 and Scope 2 helps establish the data foundations, internal ownership, boundaries, activity data collection process and reporting discipline needed to do this properly. Then Scope 3 can be tackled in a way that is prioritised, evidence-based and proportionate.

This is also where the Australian reporting environment becomes highly relevant.

Australia’s new sustainability reporting framework applies from reporting periods beginning on or after 1 January 2025, and AASB S2 requires climate-related disclosures about governance, strategy, risk management, and metrics and targets. In practice, emissions data becomes a fundamental building block for credible climate disclosure. Treasury has made clear that the policy intent of the regime is to support standardised, internationally aligned climate-related financial disclosures for in-scope entities.

That does not mean every business should dive headfirst into a sprawling Scope 3 exercise tomorrow.

It means every business should start getting serious about its emissions data now.

Even where a business is not yet legally required to report, the market is already moving. Larger customers are increasingly asking suppliers for emissions data. Tenders are asking tougher ESG questions. Boards are asking management for better visibility. Investors and financiers want to understand transition risk. Businesses that wait until disclosure pressure lands on their desk are already behind.

That is why we take a practical, technology-enabled approach.

At ESG&I, we use dedicated carbon accounting software, combined with expert input, to help clients deliver fast, affordable and accurate outcomes without months of confusion or spreadsheet chaos. Technology helps automate calculations, centralise data, improve auditability and accelerate reporting. But software alone is not the answer. It still needs the right boundaries, methodology, emission factors, assumptions and expert review to make sure the outputs are reliable and decision-useful.

That combination matters.

Geoff Gourley is a Certified Carbon Accounting Practitioner, which means clients are not just buying access to a platform. They are getting experienced support to interpret the standards, structure the inventory correctly, collect the right data, and turn raw numbers into something useful for disclosure, strategy and action.

The technology component is typically provided as an additional annual subscription, which clients procure through us as part of the service. That gives businesses an ongoing platform to manage emissions data over time, rather than treating carbon accounting as a one-off exercise that must be rebuilt from scratch every year.

That is the real shift underway.

Carbon accounting is no longer just about producing a number. It is about building a business capability. A business that understands its emissions is in a much stronger position to respond to ASRS requirements, engage customers, support procurement conversations, identify reduction opportunities and make better decisions.

And the businesses that move now will have a clear advantage over those still guessing. 

Getting a handle on your carbon emissions is now essential for every business — not just the largest and not just the listed ones. Start with Scope 1 and Scope 2. Build the foundations properly. Then tackle Scope 3 in a staged and sensible way.

If you want to understand where your business stands or need carbon accounting support backed by the right technology and expertise, get in touch with ESG&I to find out more. https://esgandi.com.au/contact