GHG Protocol

The Greenhouse Gas (GHG) Protocol establishes the global gold standard for carbon accounting, providing a comprehensive framework to measure and report GHG emissions. Developed through a partnership between the World Resources Institute (WRI) and the World Business Council for Sustainable Development (WBCSD), its primary purpose is to ensure credibility, consistency, and transparency in climate reporting. For companies, cities, and even national governments, the GHG Protocol is the foundational tool for understanding their climate impact, setting effective reduction targets, and communicating performance to stakeholders like investors, customers, and regulators.

The protocol's most critical contribution is its classification of emissions into three distinct "scopes." This categorization helps organizations identify the source of their emissions and create targeted reduction strategies.

• Scope 1: Direct Emissions. These are emissions released directly from sources that an organization owns or controls. This includes, for example, emissions from fuel combustion in company-owned vehicles or furnaces.
• Scope 2: Indirect Emissions from Purchased Energy. These are indirect emissions generated from the production of purchased electricity, steam, heating, or cooling consumed by the organization. While the emissions don't occur at the company's facility, they are a direct result of its energy use.
• Scope 3: All Other Indirect Emissions. This is the most comprehensive category, covering all other indirect emissions that occur in a company's value chain. It includes emissions from the production of purchased materials, business travel, employee commuting, waste disposal, and the use of the company's sold products. For many businesses, Scope 3 emissions are the largest portion of their total carbon footprint.

Concrete Use Case

Imagine a European automotive manufacturer. To comply with sustainability reporting and inform its climate strategy, it uses the GHG Protocol:

1. Scope 1 emissions would include the natural gas burned in its paint shop ovens and the diesel used in its on-site logistics trucks.
2. Scope 2 emissions would be the emissions generated by the power plants that supply electricity to its assembly lines and corporate offices.
3. Scope 3 emissions would be vast, including the carbon footprint of producing the steel and plastics it buys, emissions from shipping cars to dealerships, and even the emissions generated by customers driving the cars it sells.

By calculating these scopes, the manufacturer can identify its biggest emission sources (e.g., steel procurement) and take action, such as sourcing greener materials or investing in efficiency. This detailed accounting is also essential for reporting under frameworks like the CSRD and for managing compliance costs within carbon markets (learn more about the EU Emissions Trading System (EU ETS)).