Understanding your company’s carbon footprint used to be a voluntary exercise in corporate responsibility. In 2026, it’s a legal obligation for thousands of companies, and Scope 3 emissions, which typically account for 70-90% of a company’s total carbon footprint, are at the center of it.
This guide breaks down what Scope 1, 2, and 3 emissions mean, how they apply to supply chain operations specifically, what regulations now require, and how leading shippers are building the data infrastructure to measure and reduce them.
What are Scope 1, 2, and 3 emissions?
The Greenhouse Gas Protocol Corporate Standard, which underpins most major reporting frameworks, divides emissions into three categories:
Scope 1: Direct emissions
Emissions from sources your organization owns or directly controls. For a shipper or manufacturer, this means your owned fleet vehicles, on-site equipment, and any fuel combustion within your facilities. These are the easiest to measure and the most directly under your control.
Scope 2: Indirect emissions from purchased energy
Emissions from the generation of electricity, steam, heat, or cooling that you purchase and consume. If your distribution center runs on grid electricity, the upstream emissions from generating that electricity are Scope 2. Many companies have made significant Scope 2 progress through renewable energy procurement and on-site generation.
Scope 3: Value chain emissions
Everything else – the emissions from your upstream and downstream value chain that you don’t directly own or control. The GHG Protocol defines 15 categories across upstream and downstream activities. For most manufacturers, shippers, and retailers, Scope 3 dwarfs Scopes 1 and 2 combined.
The most material Scope 3 categories for supply chain-intensive businesses include:
- Category 1 Purchased goods and services: Often 50%+ of total Scope 3 for manufacturers and retailers. Every product you buy carries the embedded emissions of its production.
- Category 4 Upstream transportation and distribution: The emissions from freight carriers moving goods to you. This is where supply chain visibility data is directly actionable.
- Category 9 Downstream transportation and distribution: Emissions from moving finished goods to customers, including last-mile delivery.
- Category 11 Use of sold products: Critical for automotive, electronics, and appliance manufacturers whose products generate emissions over their lifetime.
- Category 12 End-of-life treatment: Relevant for manufacturers responsible for product take-back or whose products end up in landfill.
Scope 3 emissions typically represent 70-90% of a company’s total carbon footprint. Under CSRD, they are now legally mandatory to disclose where material.
— CSRD ESRS E1, 2026
The regulatory landscape in 2026
The emissions reporting landscape shifted significantly between 2024 and 2026. Here’s where the major frameworks stand:
EU Corporate Sustainability Reporting Directive (CSRD)
The CSRD is the most consequential emissions-reporting regulation for global supply chains. It mandates Scope 3 disclosure (where material) under ESRS E1, requires double materiality assessment, and demands auditable data with traceable methodologies.
The phased implementation timeline:
- 2025 reporting year (reports due 2026): Large companies meeting two of three criteria – 250+ employees, €50M+ revenue, or €25M+ total assets
- 2026 reporting year (reports due 2027): SMEs listed on EU-regulated markets
- 2028 reporting year: Non-EU companies with significant EU operations
Importantly, the EU Omnibus Simplification Package I, provisionally agreed in December 2025, reduced the number of mandatory reporting data points by approximately 61% (from ~1,100 to ~430). However, Scope 3 GHG disclosure requirements were preserved, meaning even the simplified standard requires supply chain emissions data.
California’s climate disclosure laws
SB 253 (Climate Corporate Data Accountability Act) requires companies with more than $1 billion in annual revenue operating in California to disclose Scope 1, 2, and 3 emissions, making it the most comprehensive US state-level climate reporting requirement. For global companies with California operations, this is effectively mandatory regardless of whether they are subject to the EU CSRD.
EU Carbon Border Adjustment Mechanism (CBAM)
CBAM took effect in 2026, requiring companies to account for the embedded carbon emissions in certain imported goods, including steel, aluminum, cement, and fertilizers. For manufacturers and importers of these materials, Scope 3 Category 1 data is no longer just a reporting requirement, it’s a cost input.
Why Scope 3 Category 4 (freight transport) is where visibility matters most
For supply chain teams, the most immediately actionable Scope 3 category is Category 4: upstream transportation and distribution. Unlike Category 1 (purchased goods) or Category 11 (product use), Category 4 emissions are directly influenced by decisions your logistics team makes every day: carrier selection, mode choice, route optimization, and shipment consolidation.
The problem is that calculating Category 4 emissions accurately requires data most companies don’t have in a usable form: actual carrier fuel consumption, distance traveled by mode, load factors, and vehicle type, all at the shipment level, not estimated from average emission factors.
This is where supply chain visibility platforms become the data infrastructure for emissions measurement. project44’s emissions tracking capability provides:
- Shipment-level emissions calculations across ocean, air, rail, FTL, LTL, and parcel modes
- Carrier-specific emission factors based on actual vehicle and route data rather than generic averages
- Mode comparison analytics that show the emissions cost of expediting by air vs. holding in inventory vs. ocean routing
- Scope 3 Category 4 reports formatted for CSRD ESRS E1 and GHG Protocol compliance
Category 4 (upstream transportation) is one of the most actionable Scope 3 categories for supply chain teams because carrier and mode decisions are within logistics’ direct influence.
How to build a credible Scope 3 measurement program
CSRD and the GHG Protocol allow for estimates and secondary data in early reporting years, with the expectation that data quality will improve over time. But “improving data quality” requires having a plan. Here’s the practical sequence for supply chain teams:
- Start with materiality. Not all 15 Scope 3 categories are equally significant for your business. Identify which 2-4 categories represent the majority of your emissions exposure before trying to measure everything.
- Establish a transportation data baseline. Pull 12 months of shipment data by mode, carrier, lane, and weight. This is the input for Category 4 and 9 calculations.
- Use a visibility platform with built-in emissions calculation. Manual calculations from average emission factors have too much error to be audit-ready. Shipment-level data from a visibility platform provide the granularity that the CSRD and the GHG Protocol require.
- Engage your top 20 carriers on primary data. The SBTi requires Scope 3 targets for any company where value chain emissions exceed 40% of total, a threshold most companies exceed. Carrier-level primary emissions data dramatically improves your reporting accuracy and credibility.
- Align reporting timelines with regulatory deadlines. CSRD requires limited assurance from the date of initial reporting for your applicable cohort. That assurance requirement means your data and methodologies need to be documented, not just calculated.
The connection between visibility and emissions reduction
Measuring Scope 3 emissions is the prerequisite for reducing them. But the opportunities for supply chain teams to reduce costs are substantial: modal shift from air to ocean or rail, carrier consolidation onto more fuel-efficient fleets, route optimization to reduce empty miles, and shipment consolidation to improve load factors.
Each of these levers requires the same underlying data infrastructure as emissions measurement: real-time shipment tracking, carrier performance data, and lane-level analytics. Companies that invest in supply chain visibility for operational reasons are simultaneously building the data foundation for emissions compliance and making the business case for visibility investment significantly stronger than it was three years ago.
