Category 1, purchased goods and services, is almost always the largest for manufacturers, followed by upstream transportation (category 4). Downstream, use of sold products (category 11) can dominate for energy-using products, while end-of-life treatment (12) and downstream transportation (9) are often underestimated. A materiality screening shows where to start.
Scope 3 emissions are the part of carbon accounting that nobody finds simple, and manufacturing companies tend to feel that complexity more than most. Unlike scope 1 and 2, which cover what happens on your own site and with your purchased energy, scope 3 captures everything else: the raw materials extracted before your factory touches them, the logistics that move goods around the world, and what happens to your products long after they leave your hands. For manufacturers, that can easily represent 80 to 90 percent of total emissions. So knowing which scope 3 categories actually matter for your sector is not a minor detail. It’s the difference between a reporting exercise and a real decarbonization strategy.
The GHG Protocol organizes scope 3 into 15 categories, split between upstream (activities before production) and downstream (activities after production). Not all of them will be material for every manufacturer, but several tend to show up as significant almost universally. Here’s a closer look at where the emissions actually live in a manufacturing value chain, and how to decide which ones deserve your attention first.
How manufacturing value chains drive scope 3 emissions
Manufacturing sits in the middle of long, complex value chains. Materials come in from suppliers, get transformed through energy-intensive processes, and then travel outward to customers, end users, and eventually disposal or recycling streams. Every step in that chain carries embedded emissions, and because manufacturers typically source globally and sell globally, the footprint can span dozens of countries and hundreds of suppliers.
What makes this particularly challenging is that most of those emissions happen outside your direct control. You can install solar panels on your roof and switch to a renewable energy tariff, but you cannot directly dictate how your steel supplier powers its blast furnace or how a retailer stores your finished goods. That indirect nature is precisely why scope 3 categories require a different approach to measurement and reduction than scope 1 and 2. It calls for supply chain engagement, product design decisions, and sometimes commercial conversations that go well beyond the sustainability team.
Upstream categories with the highest impact for manufacturers
For most manufacturers, the upstream side of scope 3 is where the bulk of emissions sit, and two categories in particular tend to dominate.
Category 1: Purchased goods and services is almost always the largest for manufacturers. This covers the emissions embedded in every raw material, component, and service you buy. Think steel, aluminum, plastics, chemicals, electronic components, and packaging. Because these materials often require energy-intensive extraction and processing, their embedded carbon can be substantial. A manufacturer that buys significant volumes of primary aluminum or cement-based materials, for example, will find this category dominates their entire footprint.
Category 4: Upstream transportation and distribution captures the emissions from moving those purchased goods to your facilities. Depending on how global your supply chain is and whether you rely on air freight for urgent components, this can be surprisingly large. Companies that have shifted to just-in-time sourcing from distant suppliers often find this category has grown over time.
Two other upstream categories are worth flagging. Category 3: Fuel and energy-related activities covers the emissions associated with extracting and processing the fuels and energy you use, even before they reach your site. This is separate from scope 2 and often overlooked. Category 2: Capital goods covers the embedded emissions in the machinery, equipment, and infrastructure your operations depend on. For manufacturers that invest heavily in new production lines or facilities, this can be material in the years when that investment happens.
Taken together, these upstream categories tell a clear story: the further back you look in your supply chain, the more emissions you tend to find. That’s why category 1 alone is often the starting point for any serious scope 3 reduction program in manufacturing.
Downstream categories manufacturers often underestimate
Downstream emissions get less attention than upstream ones, partly because they feel even further removed from daily operations. But for certain types of manufacturers, they can be just as significant, and sometimes larger.
Category 11: Use of sold products is the one that catches many manufacturers off guard. It covers the emissions generated when customers actually use what you make. If you manufacture appliances, vehicles, heating systems, industrial machinery, or any product that consumes energy during its lifetime, those use-phase emissions belong in your scope 3. For some product categories, the use phase accounts for the vast majority of lifetime emissions, which makes product efficiency and design central to any reduction strategy.
Category 12: End-of-life treatment of sold products covers what happens when your products reach the end of their useful life, including landfill, incineration, and recycling. Manufacturers producing goods with complex material compositions or limited recyclability will find this category more material. As circular economy expectations grow and regulations like the EU’s ecodesign rules expand, this category is becoming harder to ignore.
Category 9: Downstream transportation and distribution is another one that manufacturers often underreport. If you sell to distributors or retailers and don’t control the logistics, those transport emissions still sit in your scope 3. The further your products travel after leaving your facility, the more this adds up.
The common thread across these downstream categories is that reducing them often requires changes to the product itself, not just the production process. That’s a fundamentally different challenge, and one that typically involves product designers, engineers, and commercial teams alongside sustainability specialists.
How to prioritize categories using materiality screening
With 15 categories to consider, the practical question is always: where do you start? Materiality screening is the structured way to answer that, and it’s the approach the GHG Protocol recommends for scope 3 reporting.
The basic idea is to assess each category against two dimensions: how significant the emissions are likely to be, and how much influence you have over them. Categories that score high on both are your priorities. Categories that are likely small or where you have very little leverage can be deprioritized, at least initially.
In practice, a materiality screening for a manufacturer typically involves a few steps:
- Spend-based estimation: Using your procurement data to estimate emissions for purchased goods and services gives you a rough but fast picture of where category 1 sits. It’s not precise, but it tells you whether you’re dealing with thousands or millions of tonnes of CO2e.
- Activity data review: For transport categories, logistics data and freight volumes give a clearer picture than spend alone. Looking at freight modes, distances, and volumes helps prioritize category 4 and 9.
- Product use analysis: For category 11, you need to think about how your products are used, for how long, and how much energy they consume. This often requires input from product engineering teams.
- Qualitative influence assessment: Some categories may be large but nearly impossible to influence in the short term. Others may be smaller but highly actionable. Both dimensions matter when setting priorities.
Materiality screening isn’t a one-time exercise. As your business changes, as suppliers shift, and as product portfolios evolve, the relative significance of different categories can shift too. The goal isn’t to produce a perfect number for every category on day one. It’s to focus your measurement and reduction efforts where they’ll have the most impact, and to document your reasoning clearly enough to satisfy reporting requirements like CSRD.
Common reporting challenges specific to manufacturers
Even with a clear sense of which categories matter, manufacturers face a set of practical obstacles that make scope 3 reporting genuinely difficult. These aren’t unique to any one company. They show up consistently across the sector.
Data availability is the most cited challenge. Supplier-specific emissions data is hard to collect at scale. Most manufacturers work with dozens or hundreds of suppliers, and getting primary emissions data from all of them is rarely feasible. This pushes companies toward spend-based or industry-average emission factors, which introduce uncertainty into the numbers. The gap between what’s reported and what’s actually happening in the supply chain can be significant.
Boundary-setting decisions also create complexity. Deciding which entities and which activities fall inside your scope 3 boundary requires judgment calls that can meaningfully change your reported totals. Companies within the same sector sometimes make different choices, which makes peer comparisons tricky.
Downstream categories add another layer of difficulty. Estimating use-phase emissions requires assumptions about how customers use your products, in what markets, over what lifespan, and under what conditions. Those assumptions can be contested, and getting them right often requires collaboration between sustainability teams and product or technical teams who may not be used to working on emissions accounting.
Finally, there’s the challenge of aligning scope 3 reporting with frameworks like CSRD or CDP disclosures. Each has its own requirements around materiality, methodology, and assurance. Manufacturers that are subject to CSRD reporting in 2026 are discovering that the level of rigor expected is considerably higher than what many companies have been applying to their voluntary disclosures. Working with specialists who understand both the GHG Protocol methodology and the specific reporting framework you’re working within makes a real difference here.
Ready to tackle your scope 3 reporting with the right expertise?
Scope 3 is genuinely complex, and manufacturing companies face some of the steepest challenges in the field. Getting it right takes a combination of methodological knowledge, supply chain understanding, and familiarity with the reporting frameworks that apply to your business. That’s a lot to ask of an internal team, especially when the work is project-based or tied to a specific reporting deadline.
That’s where Dazzle comes in. We match organizations with pre-screened sustainability freelancers, including scope 3 emissions specialists and CSRD reporting experts, based on your specific challenge. Whether you need someone to lead a materiality screening, build out your category 1 data collection process, or prepare your scope 3 disclosure, we can connect you with the right expert within 48 hours. No lengthy procurement processes, no generalist consultancies charging for learning on the job. Just the right specialist, ready to get started. Reach out to our team, and let’s find your match.
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