In a world increasingly focused on climate change and sustainability, understanding and measuring greenhouse gas (GHG) emissions generated by a company is no longer a choice: it's a necessity. To do this rigorously and comprehensively, the categories "Scope 1, 2, and 3" are used, which allow distinguishing direct and indirect emissions according to their origin and context.
This globally adopted approach is the foundation for a credible emissions inventory, for defining decarbonization strategies, ESG/CSR reporting, and assessing the actual "carbon footprint". Additionally, it helps identify critical areas for intervention: from energy efficiency to supply chain, from production processes to logistics, and indirect consumption.
In this article, we will analyze what Scope 1, 2, and 3 emissions mean, the differences between them, how to calculate them with concrete examples, the challenges particularly related to Scope 3, and finally how carbon credit compensation can represent a complementary (not substitutive) approach to an emission reduction strategy.
What are greenhouse gases (GHG) and why are "scopes" used
To understand corporate emissions, we must first discuss greenhouse gases (GHG). These gases — including carbon dioxide (CO₂), methane (CH₄), nitrous oxide (N₂O), and others like HFCs, PFCs, SF₆ — are responsible for global warming when released into the atmosphere in large quantities.
Measuring GHG emissions is essential for any organization (company, entity, institution) that wants to assess its environmental impact, report it, define reduction targets, and develop mitigation plans.
To have a clear and comparable framework over time (and between companies), an international classification system was developed: the GHG Protocol. This standard defines three "scopes" or areas — Scope 1, Scope 2, and Scope 3 — each corresponding to different types of emissions, depending on the source and degree of control by the organization.
Through this approach, companies can build a comprehensive inventory of their emissions, identifying not only those generated internally but also those linked to the value chain, energy consumption, suppliers, transportation, product use by customers, and much more.
Scope 1: Direct Emissions — What They Include
Emissions classified as Scope 1 are those directly generated by the company, from sources that the company owns or directly controls.
Common Types of Scope 1 Emissions
- Fossil fuel combustion for boilers, furnaces, production facilities, space heating, industrial processes.
- Use of company vehicles (cars, vans, trucks, transport vehicles) that consume fossil fuels.
- Process emissions: production activities that generate greenhouse gases as waste (e.g., chemical production, emissions from reactions, treatments, industrial processes).
- "Fugitive emissions": unintentional greenhouse gas leaks, for example from refrigeration equipment, gases contained in machinery, pressurized systems, gas leaks, etc.
Scope 1 emissions are relatively "simple" to identify and measure because they involve directly controlled sources. This makes direct control possible (e.g., switching to electric vehicles, renewable sources, internal energy efficiency).
However, alone they don't represent the entire corporate impact: they ignore indirect emissions from purchased energy or value chain, which are often very significant.
Scope 2: Indirect Emissions from Purchased Energy
Scope 2 emissions include those indirect emissions related to energy purchased and consumed by the organization: electricity, heat, steam, cooling.
In practice: the company uses energy produced by third parties (not directly controlled), but the company's use of that energy generates emissions. While not "direct," they are the responsibility of the company consuming the energy.
Typical Examples of Scope 2 Indirect Emissions
- Electricity to power offices, production facilities, lighting, computers, machinery.
- Heating or cooling through purchased energy (centralized boilers, district heating, HVAC systems).
- Industrial production requiring purchased electrical or thermal energy.
Why Measuring Scope 2 is Important
Even though the company doesn't "produce" the emissions directly, energy consumption represents a significant portion of GHG. Measuring them allows evaluating the real impact of the activity and identifying reduction solutions (energy efficiency, renewable energy purchase, consumption optimization).
Scope 3: Indirect Emissions in the Value Chain — Upstream and Downstream
Scope 3 is perhaps the most complex, but also the most relevant for many companies. It includes all indirect emissions — not included in Scope 2 — that occur in the organization's value chain, both upstream and downstream.
What Scope 3 Includes
According to the GHG Protocol, Scope 3 can be divided into 15 categories, including: purchased goods and services, transportation and distribution, business travel, employee commuting, use of sold products, end-of-life treatment of products, waste disposal, leasing, investments, logistics, outsourcing, and much more.
In summary, it includes every emission generated "before" and "after" the company's activities, as long as it's connected to its value chain: from suppliers to end customers, from raw material transport to distribution, from product use to disposal.
Key Characteristics of Scope 3 Emissions
- Breadth: Scope 3 covers a very wide range of activities — often broader than direct operations.
- Quantitative importance: for many companies, Scope 3 represents the majority of their total carbon footprint. Some estimates indicate it can reach up to 70-90% of total emissions.
- Measurement difficulty: data collection requires information from suppliers, customers, transporters, end users, and many other entities external to the company — making it complex, often with limited visibility and control.
Comparison between Scope 1, 2, and 3: Summary Table
| SCOPE (GHG PROTOCOL) | TIPO DI EMISSIONI | FONTE/ORIGINE | ESEMPI | FACILITÀ DI CALCOLO E DI CONTROLLO |
|---|---|---|---|---|
| SCOPE 1 | Dirette | Fonti possedute o controllate dall’azienda | Combustione caldaie, emissioni impianti, veicoli aziendali | Alta — dati interni, controllo diretto |
| SCOPE 2 | Indirette (energia) | Energia acquistata esternamente (elettricità, calore, vapore) | Consumo elettrico uffici/stabilimenti, teleriscaldamento, HVAC | Medio — dati energetici, fattori emissivi |
| SCOPE 3 | Indirette (catena del valore) | Processi e attività upstream/downstream non controllati direttamente | Materie prime, logistica, trasporti, rifiuti, uso prodotto, fine vita | Bassa — dati esterni, complessità e variabilità |
How to Calculate Scope 1, 2, and 3 Emissions
To quantify an organization's GHG emissions and build its carbon footprint, it's necessary to follow a standard methodology. The most widely used international reference is the GHG Protocol, which defines rules, organizational boundaries, sources to consider, categories, and inventory procedures.
Main Steps for Quantifying Corporate Emissions
- Defining Organizational Boundaries
- Establish which entities, locations, assets, controls are included in the inventory (operational or equity control models).
- Identification of Emission Sources
- Internal (combustion, vehicles, processes) → Scope 1
- Purchased energy (electricity, heat, steam) → Scope 2
- Supply chain activities, transport, purchases, logistics, product use and end-of-life → Scope 3
- Data Collection
- Energy consumption (kWh, m³ gas, fuel), kilometers traveled, quantities of raw materials purchased, transport data, waste, logistics, product use, etc.
- Attribution of Emission Factors
- Convert data to CO₂-equivalent (CO₂e), considering different GHGs (CO₂, CH₄, N₂O, HFCs, etc.).
- Summation and Reporting
- Calculate total emissions for each scope and the overall carbon footprint.
- Document the methodology, boundaries, assumptions, data sources. This ensures transparency, repeatability, and credibility, essential for ESG reports, audits, certifications.
Practical Considerations
For Scope 1 and 2, data is often available internally: how much gas/fuel was used, how many kWh of electricity, how many km traveled with company vehicles, etc. This makes measurement relatively straightforward.
For Scope 3, however, data collection is complex. It requires involving suppliers, transporters, end users, partners, collecting reports, estimates, and in many cases making assumptions. For this reason, Scope 3 often has the greatest uncertainty.
Despite the difficulty, ignoring Scope 3 can mean greatly underestimating a company’s total carbon footprint — risking greenwashing, wrong perception of impact, and poor credibility towards stakeholders, investors, consumers.
Why It's Important to Consider All Three Scopes: Impact, Transparency, and Decarbonization
Considering and measuring Scope 1, 2, and 3 emissions allows the company to have a real and complete picture of its carbon footprint. This has several implications:
Identify critical emission areas: for example, supply chain, transport, logistics, purchases, product use — areas where concrete intervention is possible.
Define coherent reduction strategies: energy efficiency, renewable energy, supply chain reorganization, sustainable purchasing, green logistics, circular economy, production cycle optimization.
Make impact transparent: for stakeholders, customers, investors — increasingly required by regulations, ESG/CSRD requirements, markets.
Build credibility and reputation: responsible, aware, transparent company; avoids greenwashing accusations, demonstrates real commitment.
Prepare for decarbonization and carbon neutrality objectives: with a complete inventory, the company can define targets (reduction + compensation), monitoring, reporting.
Many organizations today have managed to significantly reduce their emissions by considering all scopes and setting up integrated decarbonization plans.
Scope 1, 2, 3 and Carbon Footprint: How They Connect
The concept of carbon footprint — that is, the overall greenhouse gas (GHG) footprint generated by an organization, product, or activity — is based precisely on the sum of all emissions, direct and indirect.
A complete inventory according to Scope 1, 2, and 3 is the prerequisite for calculating a credible carbon footprint. Only then can you have real data on which to base reduction strategies, decarbonization plans, ESG assessments.
Without considering Scope 3 — that is, the part of emissions linked to the value chain — there’s a risk of having an incomplete and potentially misleading picture of the company’s impact, with profound implications for sustainability, reputation, responsibility.
Role of Carbon Credits and Compensation Solutions
Even with the best efforts to reduce emissions — efficiency, renewable energy, supply chain optimization — it is often difficult to completely eliminate all emissions, especially indirect ones linked to the value chain (Scope 3).
For this reason, many companies adopt a mixed approach: reduction + compensation. This means:
Reduce direct and indirect emissions as much as possible through structural interventions
For residual emissions, consider compensation through certified carbon credits (carbon credits / carbon offsets)
In this context, a serious, transparent, and rigorous project like that offered by organizations working on reforestation, environmental regeneration, and conservation — such as Carborea (or similar initiatives) — takes on a strategic role: it allows companies to compensate (partially or totally) for residual emissions, concretely contributing to the net reduction of greenhouse gases, supporting territorial regeneration, and strengthening their ESG credibility.
It’s important to emphasize that compensation should not be seen as a “shortcut,” but as a residual measure: the primary objective remains the real reduction of emissions. Only afterward — and only for unavoidable emissions — can compensation represent a responsible and transparent tool.
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Generated in Italy (Salento) with methodology validated by RINA and verified ex-post by Climate Standard. Useful for compensating scope 1, scope 2, and scope 3 emissions.
Practical Examples of Corporate Emissions for Each Scope
To make the description concrete, here are some examples of how emissions manifest in different types of companies.
Service Company / Offices
Scope 1: heating boilers, fossil fuel facilities, company vehicles for business trips.
Scope 2: electricity for offices, servers, lighting, air conditioning, centralized heating or cooling.
Scope 3: employee commuting (home-work transport), purchase of PCs and equipment, external services (cleaning, catering), office material transport, waste disposal, use of cloud services from external data centers, business travel, events, third-party suppliers, indirect consumption.
In this case, Scope 3 can easily represent the majority of the carbon footprint, often exceeding Scope 1 + 2.
Manufacturing Company
Scope 1: combustion for industrial furnaces or boilers, process emissions, fuel consumption in internal vehicles, refrigerant or process gas leaks.
Scope 2: electricity for machinery, production facilities, lighting, HVAC, purchased steam or heat.
Scope 3: purchased raw materials (emissions generated in their production), transport of raw materials and finished products, logistics, product use by customer, product end-of-life, disposal, packaging, outsourcing, spare parts, support services, after-sales services, retailers, customer journey, external transport infrastructure, etc.
In many industrial companies, the Scope 3 component can far exceed direct emissions, becoming the dominant part of the total carbon footprint.
Emissions Calculation: A Simplified Numerical Example
Suppose a company in one year consumes:
Diesel for boiler + vehicles: emits 100 tons CO₂e (Scope 1)
Purchased electricity: generates 50 tons CO₂e (Scope 2)
Purchased materials + transport + logistics + end-of-life + waste + commuting + disposal: totals 300 tons CO₂e (Scope 3)
In this case, the total carbon footprint would be 450 tons CO₂e, of which approximately 66% comes from Scope 3. This example shows how indirect emissions — if not considered — can compromise the accuracy and credibility of the entire inventory.
Conclusion
Measuring, understanding, and reporting a company’s greenhouse gas emissions is now essential for anyone who wants to seriously address sustainability. The Scopes 1, 2, and 3, defined by the GHG Protocol, provide a recognized and structured framework for building a comprehensive inventory — fundamental for a credible carbon footprint.
While Scope 1 and 2 cover direct emissions and those related to purchased energy, Scope 3 represents the largest, most complex, and often most significant part: what occurs in the value chain, from suppliers to customers, throughout the entire lifecycle of products and services.
For a responsible and transparent approach to decarbonization, it is therefore important to consider all three scopes. And, when it’s not possible to eliminate every emission, consider complementary solutions — such as carbon credits — provided they are based on real, certified, and verifiable projects.
Every company — regardless of size or sector — can start building their GHG inventory today, define reduction targets, identify priorities, and concrete actions. Only then does sustainability become a real, effective, and credible strategy.
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