You cannot manage what you cannot measure. For businesses serious about climate action, the Greenhouse Gas Protocol provides the framework to do both, organising all greenhouse gas emissions into three scopes that together cover a company’s full climate impact.
Here is what each scope means, why all three matter, and how understanding them positions your organisation to manage risk, meet compliance obligations, and build a sustainability strategy that creates lasting business value.
Scope 1 Emissions and the Framework That Defines Them
The Greenhouse Gas Protocol Corporate Standard organises all emissions a business is responsible for into three scopes, providing organisations with a consistent and credible basis for measurement.
Scope 1 is where most start: direct GHG emissions from sources the organisation owns or controls.
These fall into four categories:
- Stationary combustion: on-site boilers, furnaces, and generators
- Mobile combustion: company vehicles that burn fuel
- Process emissions: industrial processes that release greenhouse gases without burning fuel
- Fugitive emissions: accidental leaks from refrigeration systems and industrial equipment
Because Scope 1 sits entirely within a company’s own operations, it is the most straightforward to measure and the most immediate to act on.
Scope 2 Emissions: What Your Energy Bills Are Really Costing the Climate
Every time your business draws from the grid, someone else burns fuel to generate it. Scope 2 emissions come from purchased electricity, steam, heat, or cooling and while they physically occur at the power station, they are attributed to the organisation consuming the energy. The GHG Protocol Scope 2 Guidance sets out how organisations measure and report these figures consistently.
For most businesses, purchased electricity is the biggest Scope 2 source. The greater the reliance on fossil-fuel-generated energy, the higher the figure. Switching to renewables and improving energy efficiency are the most direct ways to bring it down.
Scope 3 Emissions: Where Most of Your Climate Impact Actually Lives
Scope 3 covers all other indirect emissions across a company’s value chain. It is often the largest category and the hardest to control, but it is also where the biggest opportunities to reduce emissions sit. The GHG Protocol Corporate Value Chain (Scope 3) Standard provides the methodology organisations use to account for and report these emissions.
Upstream emissions
Are tied to everything that happens before goods or services reach your business:
- Purchased goods and services
- Capital goods
- Business travel and employee commuting
- Upstream transportation and distribution
Downstream emissions
Are tied to everything that happens after your products leave:
- Product usage by customers
- End-of-life treatment of sold products
- Downstream transportation and distribution
- Financed investments
For most organisations, Scope 3 is not just the largest emissions category, it is the one with the most untapped potential. Businesses with complex supply chains or sold products with high energy consumption during use will almost always find their greatest reduction opportunities here.
Measuring All Three Scopes: Why Partial Reporting Is Not Enough
The three scopes are mutually exclusive within a single inventory, meaning there is no double-counting. Together they cover everything:
- Scope 1: direct emissions from owned or controlled sources
- Scope 2: indirect emissions from purchased energy
- Scope 3: all remaining upstream and downstream emissions across the value chain
Many organisations start with Scope 1 and 2 because they are simpler to quantify. But stopping there means leaving the largest share of emissions unaccounted for and the greatest reduction opportunities untapped.
An organisation’s power to drive change does not stop at its front door. Measuring and influencing emissions across the full value chain is where meaningful impact happens. A complete inventory covers all three scopes, and building one means defining the organisational boundary and systematically gathering fuel records, energy bills, fleet data, travel logs, and supply chain data. The GHG Protocol’s 15 Scope 3 categories provide the framework to make that process manageable.
Scope 1, 2 and 3 Reduction Targets: Where Compliance Meets Competitive Advantage
Addressing only Scope 1 and 2 leaves the majority of a company’s climate impact unmanaged. Real progress requires action across all three:
- Scope 1: move away from fossil fuels, electrify owned vehicles, and improve on-site energy efficiency
- Scope 2: switch to renewable energy and reduce overall energy consumption
- Scope 3: work with suppliers, redesign products, and reduce emissions from business travel and employee commuting
Investors, regulators, and customers increasingly expect targets across all three scopes. The Science Based Targets initiative requires Scope 3 targets where those emissions represent 40% or more of total emissions, a threshold most companies exceed. In Australia, mandatory climate-related financial disclosures commenced 1 January 2025 under the Corporations Act 2001, with requirements extending to additional entities through to 2027. Compliance is the floor, not the ceiling. Organisations that go beyond minimum obligations and build a credible, full-scope emissions strategy are the ones that will attract investment, retain customers, and lead their industries. Learn how TGA helps businesses move from compliance to opportunity.
Let’s Turn Your Emissions Data into a Strategy
At The Growth Activists, we help Australian businesses measure their full emissions footprint, build credible inventories, and turn strategy into real progress across all three scopes. Whether you are just starting out or strengthening an existing approach, we are ready to move with you.
Get in touch today to find out how we can support your carbon and climate strategy.
