Decarbonizing the Supply Chain: A Procurement-Led Approach to Scope 3

As organizations increasingly commit to reducing their carbon footprint, one question remains: how do we translate ambition into action?

The answer depends largely on understanding the difference between Scope 1, Scope 2 and Scope 3 emissions. For most companies, Scope 1 and Scope 2 emissions are relatively straightforward to address. Energy efficiency, operational improvements and renewable energy sourcing are well-established levers.

Scope 3 is a different challenge altogether. In many industries, Scope 3 represents the majority of total emissions, sometimes as much as 90 to 95% of a company's carbon footprint. These emissions sit outside the organization's direct operations and are generated throughout the value chain, both upstream and downstream.

For most businesses, procurement is therefore at the center of the decarbonization challenge. While customer behavior and product use contribute significantly to Scope 3 emissions, a large share typically originates within the supply base. As a result, decarbonization cannot be achieved without supplier engagement.

Start with the End in Mind

Many organizations launch supplier engagement programs before fully understanding how success will be measured. A more effective approach is to begin by asking: How will we know that we have reduced our Scope 3 emissions? What data will we need? How will we collect it? Which processes already exist? Which capabilities need to be developed?

These questions help assess the gap between current capabilities and future ambitions. They also provide the foundation for a realistic implementation roadmap.

Assess the Climate Maturity of Your Supply Base

Not all suppliers are equally advanced in their climate journey. The first step is to identify where suppliers currently stand.

Starting with the most carbon-intensive categories identified through the company's carbon footprint assessment, procurement teams should evaluate supplier maturity by assessing questions such as: Has the supplier conducted a carbon footprint assessment? How frequently is it updated? Does the supplier have emission reduction targets? Are those targets aligned with the Science Based Targets initiative (SBTi)? Does the supplier have a formal decarbonization roadmap? Has it identified its major reduction levers?

The objective is not simply to collect information. It is to create a segmentation of suppliers that will determine the most appropriate engagement strategy for each group.

Engage Suppliers Where They Are

Once supplier maturity has been mapped, organizations can tailor their approach. Some suppliers may already have sophisticated climate programs and can become strategic partners. Others may require support in identifying reduction opportunities. Many may still be at the stage of completing their first carbon footprint assessment.

This creates a diverse landscape that procurement teams must manage. The key is to integrate decarbonization into supplier relationship management rather than treating it as a separate sustainability initiative.

In practice, a Pareto effect often emerges quickly: a relatively small number of suppliers account for the majority of upstream emissions. These suppliers should typically become the first priority.

Transform Procurement Practices

Supplier decarbonization ultimately requires commercial engagement. Climate objectives must become part of the business conversation. This means that procurement professionals increasingly need to manage climate performance alongside traditional performance dimensions such as quality, cost, service and innovation.

Fundamental questions arise: How should supplier selection criteria evolve? How should specifications and requirements be adapted? How should category strategies incorporate climate objectives? How should procurement teams balance competitiveness and sustainability?

Addressing these questions requires investment in procurement capability building. Without adequate training, sustainability risks being perceived as an additional constraint or a source of inflation. With the right skills and understanding, however, procurement professionals can leverage supplier sustainability performance to strengthen the overall competitiveness of their categories.

Improve Carbon Data Quality Over Time

One of the most challenging aspects of Scope 3 management is data quality. In theory, carbon accounting is straightforward: activity data multiplied by emission factors. In practice, product-level carbon data is often unavailable, incomplete or inconsistent across suppliers.

Organizations must therefore accept varying levels of data maturity and build progressively toward greater accuracy. Typical situations include carbon footprints updated irregularly, company-level data without product-level granularity, absolute emissions reported without volume normalization, and different calculation methodologies across suppliers.

Rather than waiting for perfect data, organizations should establish a clear methodology, document assumptions and continuously improve data quality over time. The objective is progress, not perfection.

Establish Strong Governance

Successful supplier decarbonization programs require robust governance. Key success factors typically include dedicated operational and steering committees, clear ownership between Procurement, Sustainability and Finance teams, shared performance indicators, integration of carbon considerations into sourcing and investment decisions, defined roles and responsibilities, short-, medium- and long-term targets, and alignment of incentives and performance management systems.

Perhaps most importantly, procurement teams should be measured not only on commercial performance but also on their contribution to sustainability objectives.

Procurement as a Driver of Business Resilience

Decarbonizing the supply chain is often presented as a sustainability challenge. In reality, it is also a resilience challenge. Climate change, resource constraints and regulatory developments are reshaping supply markets and access to critical materials.

Organizations that understand these dynamics and engage suppliers proactively will be better positioned to secure supply, manage volatility and maintain competitiveness.

Ultimately, successful Scope 3 decarbonization is less about reporting and more about transforming procurement. The organizations that succeed will be those that make environmental performance a contributor to economic performance rather than viewing it as a competing objective.