Because scope 3 covers the entire value chain, not just what you own. Scopes 1 and 2 capture your own fuel and purchased energy, while scope 3 spans 15 upstream and downstream categories, from suppliers to product use. Across most sectors that is well above 70% of total emissions.
Ask most companies where their biggest climate impact comes from, and they’ll point to their own operations: the energy they use, the fuel they burn, the emissions they can directly see and control. But for the vast majority of businesses, that’s only a small slice of the picture. The real story is scope 3, and it tends to be much larger, much messier, and much harder to ignore than anything happening within a company’s own four walls.
Understanding why scope 3 dominates most carbon footprints isn’t just an academic exercise. With frameworks like the CSRD and SBTi pushing companies to account for their full emissions picture, getting to grips with scope 3 has become a genuine business priority in 2026. So let’s break it down from the beginning.
How the three scopes divide a company’s emissions
The Greenhouse Gas Protocol, the most widely used standard for corporate emissions accounting, organizes emissions into three categories called scopes. Each scope captures a different part of a company’s emissions footprint, and understanding the distinction is the foundation for everything else.
Scope 1 covers direct emissions from sources a company owns or controls. Think of a factory burning natural gas, a company vehicle running on diesel, or an on-site boiler. These emissions happen on your premises and under your direct management. Scope 2 covers indirect emissions from purchased energy, most commonly electricity and heat. When a company buys electricity from the grid, the power plant generating that electricity releases emissions, and scope 2 is how those get attributed back to the buyer. Together, scopes 1 and 2 represent what most people traditionally think of as a company’s carbon footprint. But they’re only the beginning.
Scope 3 captures everything else: all the indirect emissions that occur across a company’s value chain, both upstream and downstream. This includes the emissions from the suppliers who make your raw materials, the freight companies that ship your products, the customers who use and eventually dispose of what you sell, and much more. It’s a wide net, and for most companies, it catches the majority of their total emissions.
Why scope 3 dwarfs scopes 1 and 2 in most industries
Across most sectors, scope 3 accounts for the overwhelming share of a company’s total greenhouse gas emissions, often well above 70% and in some industries significantly higher. The reason comes down to where value chains actually produce emissions.
Consider a consumer goods company. Its own manufacturing facility might run on renewable energy, making scope 1 and 2 relatively small. But the raw materials it sources, the packaging it buys, the logistics network that moves products around the world, and the energy consumers use when they run its products at home: all of that generates substantial emissions that the company itself didn’t directly create but is still connected to. The further back and forward you look along the supply chain, the more emissions you find.
Financial institutions are another striking example. A bank’s own offices and data centers produce relatively modest direct emissions. But the loans and investments it makes fund activities across every sector of the economy, including some of the most carbon-intensive ones. Those financed emissions fall under scope 3, which is why the financial sector has become increasingly focused on portfolio-level emissions accounting. The pattern repeats across retail, technology, food and agriculture, and most other industries: the value chain generates far more emissions than the company’s own operations ever could.
The 15 categories driving scope 3 emissions
Scope 3 is organized into 15 distinct categories under the GHG Protocol’s Corporate Value Chain Standard. These categories split between upstream activities (things that happen before a product reaches the company) and downstream activities (things that happen after it leaves). Here’s what they cover:
- Purchased goods and services: The emissions embedded in everything a company buys, from raw materials to software subscriptions. This is frequently the largest single scope 3 category for product-based businesses.
- Capital goods: Emissions from producing the equipment, machinery, and infrastructure a company purchases and uses over time.
- Fuel and energy-related activities: Emissions not already captured in scopes 1 and 2, such as the extraction and transport of fuels before they’re burned.
- Upstream transportation and distribution: Emissions from moving goods to the company, whether by road, rail, air, or sea.
- Waste generated in operations: Emissions from disposing of waste produced during a company’s own operations, including landfill and incineration.
- Business travel: Flights, train journeys, and hotel stays taken by employees on company business.
- Employee commuting: The emissions from employees traveling between home and work, regardless of transport mode.
- Upstream leased assets: Emissions from assets a company leases but doesn’t own, if not already included in scope 1 or 2.
- Downstream transportation and distribution: Emissions from moving finished products onward to customers or retailers.
- Processing of sold products: Relevant for companies that sell intermediate products that other businesses process further before end use.
- Use of sold products: Emissions generated when customers actually use the product, such as electricity consumed by a household appliance.
- End-of-life treatment of sold products: Emissions from how products are disposed of, recycled, or incinerated after their useful life.
- Downstream leased assets: Emissions from assets a company owns but leases to others.
- Franchises: Emissions from franchise operations that aren’t included in the franchisor’s scope 1 or 2.
- Investments: Emissions associated with a company’s financial investments, equity stakes, and project finance.
What’s striking about this list is how different the material categories are from one company to the next. A logistics firm might find that downstream transportation dominates, while a technology company might see purchased goods and employee commuting as its biggest drivers. A food producer, on the other hand, might find that agricultural raw materials in category one account for the lion’s share of its entire footprint. Scope 3 doesn’t look the same for any two organizations, which is part of what makes it genuinely complex to manage. That complexity is exactly where the next challenge begins.
Why scope 3 is so difficult to measure accurately
Measuring scope 3 is genuinely hard, and it’s worth being honest about why rather than glossing over it. The core problem is that most of the data you need doesn’t belong to you.
To calculate your purchased goods emissions accurately, you’d need emissions data from every supplier, covering every product or service they provide to you. Most suppliers don’t have that data readily available, and even when they do, it may not be calculated using consistent methodologies. Companies often fall back on industry-average emission factors as proxies, which can give a rough picture but miss the specifics of what’s actually happening in your supply chain. The further upstream or downstream you go, the harder the data becomes to pin down.
There’s also the question of boundaries and double-counting. If your supplier reports their own scope 1 and 2 emissions, those same emissions show up as your scope 3 category 1. That’s intentional and correct under the GHG Protocol, but it means the same tonne of CO2 can appear in multiple companies’ reports simultaneously. This makes aggregate comparisons across industries tricky and is one reason why scope 3 figures should always be read with some methodological context.
Finally, some categories involve inherently uncertain estimates. Use of sold products, for example, requires assumptions about how customers actually use what you sell, how long they keep it, and what energy mix powers it. These aren’t things any company can know with precision. The result is that scope 3 inventories always carry a degree of uncertainty, and acknowledging that uncertainty honestly is actually a sign of good practice rather than a weakness.
How companies are starting to tackle scope 3 reduction
Despite the measurement challenges, companies are making real progress on scope 3 reduction, and the approaches are becoming more sophisticated as the field matures.
Supplier engagement is one of the most direct levers available. Rather than relying on averages, companies are increasingly working directly with their key suppliers to gather primary emissions data and, in many cases, to co-invest in decarbonization. Some organizations are building supplier scorecards that include emissions performance alongside traditional criteria like cost and quality. This shifts scope 3 reduction from a reporting exercise into an active procurement strategy.
Science-based targets have also pushed scope 3 onto boardroom agendas. The SBTi requires companies setting targets under its framework to include scope 3 if it represents more than 40% of total emissions, which it does for most companies. This has created real accountability around scope 3 in a way that voluntary reporting alone never quite managed.
Product design is another underused but powerful tool. Decisions made at the design stage, about materials, energy efficiency, repairability, and end-of-life options, can significantly reduce emissions across categories 1, 11, and 12. Life cycle thinking, often supported by LCA specialists, is increasingly being built into product development processes rather than applied retrospectively.
For downstream emissions, particularly the use of sold products, the most impactful route is often improving the energy efficiency of the product itself or transitioning customers to lower-carbon alternatives. This is especially relevant in sectors like consumer electronics, appliances, and vehicles, where the use phase can dominate the entire product footprint.
None of these approaches are quick wins, and most require sustained effort across multiple teams and external partners. But the direction of travel is clear: scope 3 is moving from something companies report on to something they actively manage.
Ready to make sense of your scope 3 emissions?
Scope 3 is complex, but it’s no longer optional to address. Whether you’re preparing for CSRD reporting, setting SBTi-aligned targets, or simply trying to understand where your biggest climate impacts actually sit, getting the right expertise in place makes a real difference.
That’s where we come in. At Dazzle, we match organizations with pre-screened sustainability freelancers who specialize in exactly the kind of work scope 3 demands, whether that’s emissions accounting, supply chain engagement, or science-based target setting. You can be working with the right expert within 48 hours, with the flexibility to bring them in for a focused project or on a longer-term basis. If you’re ready to take scope 3 seriously, we’d love to help you find the right person to make it happen.
Building your first Scope 3 baseline?
Scope 3 in 100 Days is a free checklist in 4 phases, from spend data to a baseline you can defend. Reviewed by an independent Scope 3 expert.
