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Carbon and Climate

A Guide to the GHG Protocol

By 
Keslio Team
4
 minute read  
|  
April 11, 2025
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As concerns over climate change intensify, organizations worldwide are recognizing the need to measure, report, and mitigate their greenhouse gas (GHG) emissions. The increasing frequency of extreme weather events, rising global temperatures, and growing regulatory pressure have made it imperative for companies to take responsibility for their environmental impact. To achieve meaningful reductions in carbon emissions, organizations must first have a clear and standardized method for measuring their footprint. This is where the Greenhouse Gas Protocol plays a critical role.

The GHG Protocol serves as the global standard for measuring and managing emissions. It provides a comprehensive framework that enables businesses to assess their environmental impact, develop strategies for reduction, and enhance transparency in reporting. By offering methodologies tailored to different sectors and business activities, the protocol ensures consistency and comparability across industries. This has made it the foundation for numerous regulatory frameworks, voluntary sustainability initiatives, and corporate climate commitments worldwide.

Why It’s Important

The GHG Protocol plays a crucial role in helping organizations achieve their climate goals and comply with regulatory requirements. Its significance includes standardization and transparency, ensuring that emissions reporting is comparable across industries and geographies. By adopting the protocol, companies can enhance brand reputation, improve stakeholder trust, and mitigate financial risks associated with climate change. Many governments and investors require businesses to disclose their carbon footprint, and adhering to the GHG Protocol helps companies align with regulatory frameworks. Additionally, organizations aiming for carbon neutrality or net-zero emissions use the GHG Protocol as a foundation for developing reduction strategies and science-based targets.

How It Works

At its core, the GHG Protocol helps organizations quantify their greenhouse gas emissions by categorizing them into different scopes and emission sources. Measuring emissions involves collecting data on energy consumption, fuel usage, supply chain activities, and product life cycles. Companies typically rely on activity data, such as electricity consumption or transportation distances, and multiply these figures by emission factors that represent the amount of greenhouse gases released per unit of activity. These calculations take into account different types of greenhouse gases, including carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O), each of which has a different global warming potential. Through this structured approach, organizations can determine their total carbon footprint and identify areas for reduction and efficiency improvements.

How to Use the GHG Protocol

The GHG Protocol comprises several key standards and guidelines designed to help organizations measure and report their emissions effectively. These standards ensure that companies, governments, and institutions have a clear framework for emissions accounting, helping them align with international climate commitments and regulations. Here’s how to use it:

1. Define Organizational Boundaries

Businesses must decide whether to measure emissions using the equity share, financial control, or operational control approach. These approaches determine which emissions sources are included in a company’s inventory based on ownership and control over operations.

2. Identify and Categorize Emissions

Emissions are categorized into Scope 1, Scope 2, and Scope 3. Companies should carefully assess their sources of emissions to ensure accurate reporting.

What are Scope 1, 2, and 3 Emissions?

One of the most significant contributions of the GHG Protocol is the classification of emissions into three scopes. Scope 1 includes direct emissions from owned or controlled sources, such as company vehicles and on-site fuel combustion. Scope 2 covers indirect emissions from the generation of purchased electricity, steam, heating, and cooling consumed by the reporting company. Scope 3 accounts for indirect emissions occurring in the company’s value chain, including those from suppliers, business travel, and product disposal. These emissions are often the largest portion of a company’s carbon footprint and the most challenging to measure.

3. Collect and Analyze Data

Organizations must gather data on fuel consumption, energy use, transportation, waste, and supplier activities. This information is then converted into emissions values using emission factors from authoritative sources such as the Intergovernmental Panel on Climate Change (IPCC) and national government databases.

4. Calculate Total Emissions

Emission calculations involve multiplying activity data (e.g., kilowatt-hours of electricity used) by relevant emission factors. Many organizations work with sustainability experts or use carbon accounting software to automate this process and ensure accuracy.

5. Report and Verify Emissions

Transparent reporting is essential for credibility. Companies should disclose their emissions inventory in sustainability reports, investor disclosures, and regulatory filings. Third-party verification can enhance credibility and ensure compliance with frameworks.

6. Set Reduction Targets and Develop a Mitigation Strategy

Once emissions are quantified, businesses should establish reduction targets based on science-based methodologies. Strategies may include increasing energy efficiency, switching to renewable energy sources, optimizing supply chains, or purchasing carbon offsets.

Starting the Path to Net-Zero

The Greenhouse Gas Protocol is a cornerstone of corporate climate action, enabling organizations to measure, manage, and report their emissions with credibility and consistency. By adopting the GHG Protocol, businesses can contribute to global climate efforts, meet stakeholder expectations, and drive meaningful reductions in greenhouse gas emissions. As climate policies become more stringent and corporate sustainability commitments increase, adherence to the GHG Protocol will remain essential for a low-carbon future.

At Keslio, we are deeply passionate about measuring greenhouse gas emissions, having the expertise and extensive network needed to guide clients through their sustainability journey effectively and efficiently. Our expertise is particularly valuable for companies looking to embed sustainability practices into their businesses and investors looking to integrate ESG and impact into investment portfolios. 

To learn more about how Keslio can assist your organization in its sustainability journey, reach out to us here or through hello@keslio.com

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