AI for Sustainability
Scope 4 Emissions: Avoided Emissions Explained (2026 Guide)
Scope 4 emissions are the avoided emissions enabled when customers choose a low-carbon product over a higher-carbon alternative. A guide to how they are defined, calculated, and reported credibly under the 2025 WBCSD Guidance.
Sofia Fominova
Apr 19, 2026
TL;DR: Scope 4 emissions, also called avoided emissions, are the greenhouse gas reductions that occur outside a company's own value chain when customers choose its low-carbon product over a higher-carbon alternative. They are voluntary, reported separately from Scope 1, 2, and 3, and governed by the WBCSD Guidance on Avoided Emissions rather than the GHG Protocol inventory standard.
Key takeaways
Scope 4 emissions are avoided emissions: the difference between a baseline scenario and what happens when a low-carbon solution is deployed. The term originated in a 2013 World Resources Institute concept and was formalised by the WBCSD.
The 2025 update of the WBCSD Guidance on Avoided Emissions v2.0 is now the reference methodology, introducing three eligibility gates: climate action credibility, climate science alignment, and contribution legitimacy.
The Science Based Targets initiative is unambiguous: avoided emissions must be excluded from Scope 1, 2, and 3 reduction targets and reported separately.
Global clean energy investment reached USD 2 trillion in 2024, according to the IEA's World Energy Investment 2024 report, creating the single largest pipeline of avoided-emissions opportunities in history.
The GHG Protocol's 2024 restructuring proposal introduces a dedicated GHG Impact Statement for avoided emissions, signalling that the category is moving from niche to mainstream corporate disclosure.
Introduction
Net0 is an AI infrastructure company that builds AI solutions for governments and global enterprises, with a dedicated AI-powered sustainability platform used by Fortune 500 companies and public institutions to measure, reduce, and report emissions. Scope 4 emissions sit at the leading edge of corporate climate disclosure: they quantify the positive climate impact that a product or service enables for its users, beyond the company's own Scope 1, 2, and 3 inventory. Done well, Scope 4 reporting turns a low-carbon product into a measurable climate asset. Done badly, it becomes greenwashing. This guide explains what Scope 4 emissions are, how to calculate them, and how current methodology has evolved since the term was coined in 2013.
What are Scope 4 emissions?
Scope 4 emissions are the greenhouse gas reductions enabled outside a company's value chain when its product or service replaces a higher-carbon alternative. They sit outside the standard Scope 1, 2, and 3 inventory defined by the GHG Protocol, and they are not additive to it.
The term "Scope 4" was popularised after a 2013 World Resources Institute working paper, Estimating and Reporting the Comparative Emissions Impacts of Products, which introduced a framework for measuring comparative emissions impacts against a baseline scenario. The concept was then developed into a full methodology by the World Business Council for Sustainable Development (WBCSD), most recently in its July 2025 Guidance on Avoided Emissions v2.0.
Common examples include an energy-efficient LED bulb that avoids the emissions of an incandescent equivalent, a video-conferencing service that avoids business-travel emissions, low-rolling-resistance tyres that cut fuel consumption, or a solar panel that displaces grid electricity generated from fossil fuels.
A note on "home-working emissions": some companies and consultancies use the label "Scope 4" to refer to home-working or remote-work emissions. This usage is informal and is not part of the GHG Protocol or WBCSD frameworks. Under the GHG Protocol, home-working emissions are categorised within Scope 3 Category 7 (employee commuting) and are an inventory item, not an avoided-emissions claim. The rest of this guide uses "Scope 4" in its canonical sense: avoided emissions.
Scope 4 vs Scope 1, 2, and 3
Scope 4 is fundamentally different from the three inventory scopes. Scopes 1, 2, and 3 are accounting categories for emissions a company is responsible for. Scope 4 is a consequential measure of emissions a company helps others avoid. A credible emissions report keeps them separate.
The practical implications of this distinction are significant. An avoided-emissions figure cannot be subtracted from a company's own Scope 1, 2, and 3 footprint. It cannot be used to offset net-zero targets. It should always be published as a standalone number, with its baseline and methodology fully disclosed.
The WBCSD Guidance on Avoided Emissions
The WBCSD Guidance on Avoided Emissions v2.0, published in July 2025, is the most widely referenced methodology for quantifying Scope 4. It tightens earlier versions by introducing three explicit eligibility gates that a claim must pass before it can be reported.
The v2.0 release also aligns avoided-emissions reporting with the GHG Protocol, IPCC pathways, the Partnership for Carbon Accounting Financials (PCAF), and ISO standards. It introduces standardised disclosure templates and recommends third-party assurance for material claims. For companies already familiar with the rigour expected of CDP reporting, these gates translate directly into documentation requirements.
How to calculate Scope 4 emissions
Calculating avoided emissions is fundamentally a comparison exercise: the emissions that would have occurred in a baseline scenario, minus the emissions that occur when the low-carbon solution is deployed. The difficulty lies in defining each variable credibly.
The seven canonical steps:
Identify the product or service. Be specific. "Renewable energy" is too broad; "a 5 kWp rooftop solar system installed in Germany" is assessable.
Define the baseline scenario. The most honest baseline is a market-average incumbent, not the worst-performing alternative. For the German solar example, the baseline is the German grid's generation mix in the same year.
Measure the emissions of both scenarios. Use life-cycle emission factors from recognised datasets (Ecoinvent, IEA, national inventories). Cover the full life cycle where data allows, including manufacturing of the low-carbon solution itself.
Calculate avoided emissions. Subtract solution emissions from baseline emissions. The result is the gross avoided-emissions figure per functional unit (per kWh, per kilometre driven, per hour of use).
Adjust for attribution and market share. If the company sold 10 percent of the product's installed base, attribute 10 percent of the avoided emissions. WBCSD v2.0 requires explicit documentation of attribution assumptions.
Test system boundaries, including rebound effects. A classic rebound occurs when more efficient lighting leads to more lights left on, eroding the calculated saving. Serious assessments model rebound explicitly.
Verify. Seek third-party assurance for material claims. Document baseline selection, data sources, methodological choices, and uncertainties so the number is auditable.
Automated carbon accounting platforms shorten steps 3 to 5 considerably by pre-populating emission factors and applying attribution logic consistently across a product portfolio.
Worked example: LED vs incandescent lighting
Suppose a lighting company sells a 10-watt LED bulb that replaces a 60-watt incandescent bulb in a typical household application.
Functional unit: 1,000 hours of equivalent light output per year.
Incandescent energy use: 60 W x 1,000 h = 60 kWh per year.
LED energy use: 10 W x 1,000 h = 10 kWh per year.
Emission factor: 0.5 kg CO2e per kWh (a simplified average grid factor; real assessments use country-specific values).
Baseline emissions: 60 kWh x 0.5 = 30 kg CO2e per bulb per year.
Solution emissions: 10 kWh x 0.5 = 5 kg CO2e per bulb per year.
Avoided emissions per bulb: 30 − 5 = 25 kg CO2e per year.
Company sales: 1,000 bulbs sold. Gross avoided emissions = 25,000 kg, or 25 tonnes CO2e per year.
A credible published claim would add three refinements: full life-cycle emissions of both bulbs (including manufacturing); an attribution factor if the company did not independently cause the customer to switch from incandescent; and an explicit statement that the 25 tonnes are not deducted from the company's own Scope 1, 2, and 3 inventory.
Where avoided emissions matter most
Avoided-emissions assessments are most valuable in sectors where low-carbon solutions scale quickly and where the counterfactual is well-defined. The IEA World Energy Investment 2024 report quantifies USD 2 trillion of global clean energy investment in 2024, with solar photovoltaics alone exceeding USD 500 billion. These flows define the opportunity space.
Power generation. Solar, wind, nuclear, and grid-scale storage displace fossil generation. Each dollar invested in wind or solar in 2023 delivered 2.5 times more energy output than the equivalent investment a decade earlier, according to the IEA.
Energy efficiency. LED lighting, heat pumps, efficient appliances, and smart building controls avoid emissions from heating, cooling, and electricity demand.
Transport. Electric vehicles, battery-electric buses, rail electrification, and modal shift from road and air to lower-carbon alternatives.
Industry. Green hydrogen, low-carbon cement and steel, electrification of process heat, and carbon capture on hard-to-abate processes.
Circular economy. Materials reuse, remanufacturing, and waste-to-energy projects that displace virgin production or landfill.
Digital infrastructure. Teleconferencing, cloud optimisation, and smart-grid software that reduce physical asset use.
The common thread is a clearly defined baseline. Claims are weakest in sectors where the counterfactual is contested, such as biofuels with disputed indirect land-use change, or where avoided-emissions figures mix poorly with product carbon footprint numbers.
Why Scope 4 reporting is contested
Avoided-emissions claims are powerful but easy to misuse. Three risks recur in regulatory and academic critiques.
The first is double counting. If both the solution provider and the customer claim the same avoided tonne, the atmosphere is credited twice for a single reduction. The WBCSD's contribution-legitimacy gate is designed to address this by forcing explicit attribution.
The second is baseline inflation. Choosing the dirtiest possible incumbent as the baseline produces a larger avoided-emissions number but does not reflect real-world market behaviour. WBCSD v2.0 requires baselines aligned with the latest IPCC pathways.
The third is substitution for real abatement. The Science Based Targets initiative Corporate Manual is explicit that avoided emissions are excluded from near-term and net-zero targets. Companies must reduce their own Scope 1, 2, and 3 footprint; avoided emissions are a supplementary disclosure, not a substitute. Treating Scope 4 as a net-zero lever is a well-documented greenwashing pattern that Scope 3 myths has similarly flagged for value-chain emissions.
The GHG Protocol's 2024 restructuring proposal responds to these concerns by separating consequential accounting (including avoided emissions) into a dedicated GHG Impact Statement, sitting alongside but clearly apart from the traditional physical inventory. This is the clearest institutional signal to date that avoided emissions should never be netted against Scope 1, 2, or 3.
How Net0 supports avoided-emissions analysis
Net0's AI-powered sustainability platform gives enterprises and governments the data infrastructure required for WBCSD-aligned avoided-emissions assessments.
Automated data collection from over 10,000 enterprise systems provides the primary activity data needed for both baseline and solution scenarios.
A 50,000+ factor emission-factor library covers country-specific grid factors, life-cycle data for materials, and sector-specific intensities for transport and industry.
Scenario simulation and Marginal Abatement Cost Curve (MACC) analysis lets sustainability, strategy, and product teams model baselines, attribution assumptions, and rebound sensitivities before publishing a claim.
Multi-framework reporting covers the 30+ frameworks enterprises face in parallel, including GHG Protocol, CSRD, IFRS S2, CDP, and GRI, alongside WBCSD avoided-emissions disclosure templates.
Audit-grade documentation captures baseline choice, data provenance, and methodological assumptions, shortening the third-party assurance cycle.
Net0 is used by 400+ entities across four continents, including Fortune 500 enterprises and national governments, giving avoided-emissions claims the institutional credibility that the WBCSD gates demand.
Book a demo
To see how Net0's sustainability platform quantifies avoided emissions for enterprise product portfolios, book a demo with a specialist.
Frequently asked questions
What are Scope 4 emissions?
Scope 4 emissions are avoided greenhouse gas emissions that occur outside a company's value chain when its product or service replaces a higher-carbon alternative. They are reported separately from Scope 1, 2, and 3, and are governed by the WBCSD Guidance on Avoided Emissions.
How are Scope 4 emissions different from Scope 1, 2, and 3?
Scopes 1, 2, and 3 measure emissions a company is responsible for across direct operations, purchased energy, and the value chain. Scope 4 measures emissions a company helps others avoid. Scope 4 is never added to, or subtracted from, the inventory scopes.
Are companies required to report Scope 4 emissions?
No. Scope 4 disclosure is voluntary under every major climate framework. By contrast, Scope 1 and 2 are mandatory under most regimes, and Scope 3 is increasingly mandatory under CSRD, SEC, and IFRS S2.
Who created the term Scope 4?
The concept originated in a 2013 World Resources Institute working paper on comparative emissions impacts of products. It was formalised into a reporting methodology by the WBCSD, most recently updated in July 2025 as Guidance on Avoided Emissions v2.0.
How do you calculate avoided emissions?
Define a baseline scenario, measure its emissions, measure the solution's emissions, subtract, and adjust for attribution, market share, and rebound effects. The WBCSD Guidance on Avoided Emissions v2.0 provides the reference methodology and eligibility gates.
Can avoided emissions count toward net-zero targets?
No. The Science Based Targets initiative excludes avoided emissions from near-term and net-zero targets. Companies must decarbonise their own Scope 1, 2, and 3 inventory; avoided emissions are a supplementary disclosure.
