The arithmetic of corporate climate commitments has a problem that most public announcements do not acknowledge directly. Supply chain emissions, the greenhouse gas (GHG) emissions generated by the suppliers, manufacturers, processors, and logistics providers that feed into a company's products and services, average more than 11 times a company's own operational footprint, according to the 1.5°C Supply Chain Leaders initiative's 2026 analysis. A company that has driven meaningful reductions in its own operations while leaving its supply chain largely unchanged has addressed the smaller portion of its actual climate impact.
That would be a manageable situation if the larger portion were within reach. For most organizations it is not, or not yet. Net Zero Tracker data shows that only 37% of corporate net zero targets currently cover Scope 3 emissions at all. The majority of public climate commitments were written around the emissions a company can directly control and measure, which is not where most of the impact lives. The targets are real. The scope of the ambition relative to the scope of the actual footprint is where the gap opens.
The Decisions That Will Determine Climate Outcomes Are Being Made Upstream
A supplier's energy mix, its manufacturing process efficiency, its material sourcing decisions, and the investments it makes or defers in emissions reduction technology will all feed directly into the buyer's Scope 3 inventory. When a supplier switches to renewable electricity, that change reduces the buyer's Category 1 purchased goods and services emissions. When a supplier invests in lower-carbon processing, the buyer's product footprint improves without the buyer having changed anything about its own operations. The reverse is equally true: a supplier that defers emissions reduction investment, expands carbon-intensive capacity, or shifts to higher-emission inputs pushes the buyer's Scope 3 numbers in the wrong direction regardless of what is happening inside the buyer's fence line.
This is not a theoretical risk. It is the operational reality of most corporate climate programs right now. The organizations most likely to achieve their net zero targets are those that have recognized this and built supplier engagement strategies substantive enough to actually influence those upstream decisions. The 1.5°C Supply Chain Leaders initiative tracks companies that have done exactly that, and the 2026 data is instructive: 88% of participating companies achieved Scope 3 reductions in 2024, in a year when aggregate corporate climate ambition was under significant pressure from policy reversals, cost inflation, and capital market shifts. The companies making progress are doing so through structured supplier engagement, not through the public commitment alone.
The Integrity Gap Between Announced Targets and Verifiable Plans Is Widening
Investor frameworks are starting to close the distance between climate announcements and climate accountability. Climate Action 100+, the world's largest investor climate engagement initiative, updated its Net Zero Company Benchmark framework in May 2026 to place greater emphasis on tracking real-world decarbonization outcomes rather than target-setting alone. The updated framework incorporates absolute emission metrics and climate governance indicators alongside transition plan assessment, specifically to distinguish companies that have built credible pathways from those carrying aspirational announcements without the operational infrastructure to deliver them.
The Science Based Targets initiative (SBTi) requires Scope 3 reductions when material, which for most sectors means supply chain emissions must be part of any validated near-term target. More than 10,000 companies have committed to SBTi reductions globally. The gap between commitment and implementation is where the scrutiny is now focused. RMI's analysis of corporate climate commitments notes that among the world's largest 2,000 companies, more than half have set net zero targets, but independent verification of whether those targets are backed by actionable transition plans remains limited. Ambition often exceeds implementation, and the implementation gap is most visible in the Scope 3 portion of the target.
Influence Over Supplier Climate Decisions Is Not the Same as Purchasing Power Over Suppliers
The challenge most procurement and sustainability teams run into when they try to move from collecting supplier emissions data to actually influencing supplier emissions decisions is that the two require different things. Purchasing leverage is useful for getting suppliers to respond to questionnaires and provide data. It is less reliable as a mechanism for getting suppliers to make capital investments in cleaner manufacturing processes, switch energy suppliers, or redesign sourcing strategies that have been optimized over years for cost and reliability.
Large buyers with significant concentrated spend in specific supplier relationships have more room to work with. But many of the suppliers that carry the largest Scope 3 exposure for a given buyer are also suppliers who serve many buyers simultaneously, in industries where the emissions improvement that matters most requires sector-level change rather than one buyer's purchasing criteria. The 1.5°C Supply Chain Leaders approach addresses this directly: Telia, for example, has 63% of its supply chain emissions covered by science-based targets at the supplier level, with the engagement model centered on long-term partnerships, shared planning, and direct support for supplier transition work rather than contractual requirements alone. That kind of engagement is labor and relationship intensive, and it does not scale easily across a broad supplier base without deliberate prioritization.
What Procurement Strategy Looks Like When Climate Is Part of It
The organizations moving most credibly toward supply chain emissions reductions are integrating climate performance into sourcing decisions at the category level, not just at the reporting level. That means identifying which spend categories carry the highest Scope 3 exposure, engaging directly with the suppliers in those categories on emissions reduction pathways, building longer-term sourcing agreements that create the stability suppliers need to justify emissions reduction investments, and incorporating environmental performance criteria alongside cost and quality in supplier selection. It also means being honest internally about which suppliers are irreplaceable and therefore require collaborative engagement rather than contractual pressure.
The companies most likely to achieve their climate commitments over the next decade will not be those with the most expansive public targets. They will be the ones that have built supplier relationships substantive enough to actually change what happens in facilities they do not own. That is a procurement strategy and a relationship management strategy as much as it is a sustainability strategy, and the organizations that have not yet made that connection are carrying commitments that their current supplier engagement model cannot deliver.
