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Jul 24, 2026

Understanding Scope 3 Emissions: A Complete Guide to All 15 GHG Protocol Categories

For many organizations, the majority of greenhouse gas emissions occur beyond their own operations—in supplier activities, transportation networks, product use, and end-of-life disposal. These indirect value chain emissions, known as Scope 3 emissions, often account for more than 70% of a company's total carbon footprint. In this guide, we break down the 15 Scope 3 categories defined by the GHG Protocol, explain the difference between upstream and downstream emissions, and outline practical steps for measuring, managing, and reducing value chain emissions.