In recent years, supply chain decarbonization has gained significant attention as a critical component of corporate climate action. While many organizations have already taken steps to reduce carbon emissions from their own operations, the emissions embedded in supply chains often represent the largest and most complex part of the companies’ environmental footprint. Understanding how these emissions are classified, how they occur, and how they can be measured and addressed is essential for building credible strategies for dealing with them. While Scope 1 and 2 relate to direct emissions and purchased energy, Scope 3 covers a wide range of indirect emissions across the value chain and is often the most significant source of climate impact.