What is Scope 3 Emissions?

Why It Matters

For most companies, the emissions they directly control — their factories, offices, and vehicles (Scope 1), plus their purchased electricity (Scope 2) — represent a fraction of their total climate impact. Everything else sits in Scope 3.

How much? For a typical consumer goods company, Scope 3 represents 80–95% of total greenhouse gas emissions. For a financial institution, the emissions financed through lending and investment portfolios dwarf anything happening in their office buildings. For a technology company, contract manufacturing and end-user energy consumption dominate the picture.

This reality means any serious climate strategy must grapple with Scope 3. A company can install solar panels on every facility, electrify its fleet, and purchase 100% renewable electricity — and still have barely touched its actual carbon footprint if it hasn't addressed its value chain.

The regulatory picture has shifted significantly in 2025–2026. The SEC abandoned its climate disclosure rule entirely. But the CSRD (even after its Omnibus I scope reduction) still requires Scope 3 reporting for material value chain emissions. California's SB 253 remains on the books. CDP continues to collect Scope 3 data from thousands of companies. And SBTi is overhauling how it handles Scope 3 targets. The regulatory patchwork is messy, but the direction is clear: Scope 3 measurement and reduction are becoming standard practice for large companies, driven as much by investor expectations and competitive pressure as by regulation.

The 15 Categories

The GHG Protocol Corporate Value Chain (Scope 3) Standard organizes value chain emissions into 15 categories.

Upstream categories cover everything before your product reaches you:

• Purchased goods and services — typically the largest category for manufacturers and retailers, covering cradle-to-gate emissions of everything you buy
• Capital goods — emissions from manufacturing equipment, buildings, and vehicles you purchase
• Fuel and energy-related activities — emissions from producing fuels and electricity beyond what Scope 1 and 2 capture
• Upstream transportation and distribution — moving goods from suppliers to your facilities
• Waste generated in operations — third-party treatment of your operational waste
• Business travel — flights, hotels, rental cars
• Employee commuting — daily travel between home and work
• Upstream leased assets — emissions from assets you lease but don't own

Downstream categories cover what happens after your product leaves your control:

• Downstream transportation and distribution — moving products to customers
• Processing of sold products — further manufacturing by your customers
• Use of sold products — emissions from consumers using what you sell (massive for automakers and fossil fuel companies)
• End-of-life treatment — disposal, recycling, or landfilling of products
• Downstream leased assets — emissions from assets you own but lease to others
• Franchises — emissions from franchise operations
• Investments — emissions from equity and debt investments (critical for financial institutions)

What's Changed in 2025–2026

SBTi's Scope 3 Overhaul

The Science Based Targets initiative released a draft revised Corporate Net-Zero Standard in March 2025 that significantly rethinks Scope 3 target-setting. Key changes in the draft:

More flexibility in target structure. Instead of requiring a single Scope 3 reduction target, SBTi now proposes milestone-based pathways with checkpoints at 2025, 2030, and 2035 that feed into a long-term decarbonization trajectory.

Adjusted coverage thresholds. The draft revises what counts toward Scope 3 coverage, potentially making it easier for companies with complex value chains to set meaningful targets without claiming precision they don't have.

Bigger role for carbon removals. The draft gives removals a more prominent role in the net-zero framework, a controversial but practical acknowledgment that some Scope 3 emissions are exceptionally hard to eliminate through value chain action alone.

Simplified requirements for SMEs. Smaller companies, particularly those in developing economies, get reduced administrative requirements, making SBTi participation more accessible.

Public consultation ran through mid-2025, and the final standard is expected in spring 2026. Companies can continue setting targets under the current framework (Version 1.3) through 2027.

The SEC Climate Rule Collapse

In March 2025, the SEC voted to stop defending its 2024 climate disclosure rule in court, effectively killing the regulation. The rule had already excluded mandatory Scope 3 reporting during the rulemaking process, but its demise removes even the Scope 1 and 2 federal reporting requirements it contained. This leaves the US without a federal climate disclosure mandate, though California's SB 253 and SB 261 remain in effect at the state level.

GHG Protocol Updates

The GHG Protocol has been working on updates and additional guidance, particularly around market-based accounting approaches and the treatment of carbon credits within inventory boundaries. While a full revision of the Scope 3 standard hasn't been released, supplemental guidance documents have improved clarity around several categories, especially purchased goods and services and investments.

AI-Powered Measurement

One of the most significant practical developments is the maturation of AI-driven Scope 3 estimation tools. These platforms use machine learning to improve spend-based emission factor mapping, analyze supplier-specific data at scale, and identify anomalies in reported data. They don't replace primary data collection, but they're making initial inventories faster and more granular, and they're helping companies prioritize which suppliers to engage for better data.

Measurement Approaches

Companies typically use a hierarchy of data quality for Scope 3 calculations:

Supplier-specific data is the gold standard — actual emissions data from your suppliers, allocated to your purchases. Platforms like CDP Supply Chain, Ecovadis, and emerging digital product passports are making this more available, though coverage remains uneven.

Activity-based data uses physical metrics (tons of material, kilometers shipped, hotel nights) combined with emission factors. More accurate than spend-based methods but requires detailed operational data.

Spend-based data applies emission factors per dollar spent in a given category. It's the most accessible method — you already have procurement data — but also the least precise. Industry averages mask huge variation between suppliers.

Most organizations use a combination, applying higher-quality methods where data allows and spend-based estimates elsewhere.

Building an Effective Scope 3 Program

Screen first. Before investing in detailed measurement across all 15 categories, conduct a screening assessment to identify which categories are most significant. Focus your resources where emissions concentrate — for most companies, that's purchased goods and services.

Engage suppliers. Data collection alone isn't enough. Leading programs combine measurement with active supplier engagement: target-setting support, capacity building, shared best practices, and procurement incentives for suppliers that demonstrate real progress on decarbonization.

Think in products. Scope 3 forces you to consider your product's entire life cycle. Design decisions made early in product development often have the biggest impact on lifecycle emissions. Companies integrating Scope 3 thinking into R&D and product design are finding genuine competitive advantages.

Build for iteration. Your first Scope 3 inventory won't be precise. That's fine. What matters is identifying hotspots, establishing a repeatable methodology, and improving data quality year over year. Perfectionism at the outset is the enemy of progress.

Council Fire's Perspective

Scope 3 is where we see the most anxiety among clients — and the most strategic opportunity. The anxiety comes from data gaps and uncertainty margins that make the whole exercise feel futile. We understand that.

But here's what works: start with what you have, focus on materiality, and improve iteratively. Your first inventory identifies where emissions concentrate. Your supplier engagement program starts building relationships and data pipelines. Each cycle gets more precise and more useful.

The companies investing in Scope 3 capabilities now — building supplier relationships, improving data systems, integrating value chain thinking into procurement and design — are building a genuine strategic advantage. Those waiting for regulatory certainty will find themselves scrambling under deadline pressure with less leverage and less time.

Council Fire helps clients build Scope 3 programs that are practical and strategically useful — from initial screening through supplier engagement design and integration with SBTi targets.