Case study: How a consumer goods company halved Scope 3 emissions through supplier collaboration

Why It Matters

For the average consumer goods company, Scope 3 emissions account for more than 90 percent of the total carbon footprint (CDP, 2025). Unilever reported in its 2024 Climate Transition Action Plan that purchased goods and services alone represented roughly 60 percent of its entire greenhouse gas output. Despite this dominance, fewer than 40 percent of companies reporting to CDP in 2025 had set specific Scope 3 reduction targets with clear supplier engagement mechanisms. The gap between ambition and action leaves billions of tonnes of CO₂e unaddressed each year. This case study documents how a multinational consumer goods company used direct supplier collaboration to cut Scope 3 emissions by half across its highest-impact procurement categories, offering a replicable blueprint for procurement and sustainability teams worldwide.

Key Concepts

Scope 3 emissions encompass all indirect emissions that occur in a company's value chain, both upstream (purchased goods, logistics, business travel) and downstream (product use, end-of-life treatment). For consumer goods manufacturers, upstream categories such as raw material cultivation, ingredient processing, and packaging production dominate the Scope 3 profile.

Supplier decarbonization programs are structured initiatives in which a buyer provides technical assistance, capacity building, co-investment, or preferential procurement terms to help suppliers reduce their own Scope 1 and 2 emissions, which flow into the buyer's Scope 3 inventory.

Activity-based accounting replaces spend-based emission factors with supplier-specific primary data, improving accuracy. The GHG Protocol's updated Scope 3 Calculation Guidance (2024) emphasizes primary data collection as the preferred method for Categories 1 and 4.

Science Based Targets initiative (SBTi) requires companies with significant Scope 3 emissions to set near-term targets covering at least 67 percent of total Scope 3 emissions and to engage suppliers representing at least 67 percent of emissions in SBTi-aligned target-setting by 2027 under the Corporate Net-Zero Standard.

The Challenge

Unilever's supply chain spans more than 56,000 direct suppliers across 170 countries. In 2021 the company disclosed that its Scope 3 emissions exceeded 55 million tonnes of CO₂e, dwarfing its operational footprint of approximately 3.4 million tonnes (Unilever, 2024). Several structural barriers made reduction difficult.

First, data fragmentation meant that the company relied heavily on spend-based emission factors. According to Boston Consulting Group (2025), fewer than 25 percent of FMCG suppliers in emerging markets had the capacity to measure and report greenhouse gas data using recognized protocols. Without primary data, target-setting lacked precision.

Second, misaligned incentives prevailed. Procurement teams optimized for cost and delivery speed. Suppliers in palm oil, dairy, and packaging viewed decarbonization as a cost burden with no guaranteed return. A 2024 McKinsey survey found that 62 percent of Tier 1 suppliers to consumer goods firms cited "lack of buyer commitment" as the primary barrier to investing in low-carbon processes.

Third, fragmented supply tiers complicated engagement. Emissions were concentrated not at Tier 1 but deeper in the chain, in smallholder agriculture, chemical feedstock production, and energy-intensive material processing. Reaching Tier 2 and Tier 3 suppliers required intermediary partnerships and new governance structures.

The Approach

Unilever's Climate Programme, launched in phases between 2021 and 2025, provides the clearest documented example of a consumer goods company systematically tackling these barriers. The approach combined four interlocking strategies.

1. Supplier segmentation and hotspot mapping. The company used lifecycle assessment data and its own procurement analytics platform to identify the top 300 suppliers responsible for roughly 70 percent of Scope 3 emissions. These were concentrated in five categories: palm oil and vegetable oils, dairy ingredients, packaging (plastics and paper), chemical inputs, and logistics. Each supplier received a decarbonization maturity score based on data quality, existing targets, and renewable energy adoption.

2. The Partner with Purpose program. Launched in 2022 and expanded in 2024, this program offered qualifying suppliers access to co-funded energy audits, technical advisory services, and concessional financing for renewable energy and efficiency upgrades. Unilever partnered with the Carbon Trust and the World Business Council for Sustainable Development (WBCSD) to deliver on-the-ground support. By mid-2025, over 600 suppliers across 34 countries had enrolled, with 280 completing energy transition roadmaps (Unilever, 2025).

3. Preferential procurement incentives. Suppliers that met decarbonization milestones received longer contract terms, volume guarantees, and access to Unilever's sustainable innovation pipeline. The company integrated carbon intensity metrics into its supplier scorecard, weighted at 15 percent of the total score by 2024, rising to 25 percent in 2026. This created a direct commercial incentive: high-performing suppliers gained market share while laggards risked contract non-renewal.

4. Primary data infrastructure. Unilever deployed a cloud-based supplier data platform built on the Partnership for Carbon Transparency (PACT) framework, enabling suppliers to submit product carbon footprints in a standardized format. By the end of 2025, 42 percent of procurement spend was covered by primary emission data, up from 8 percent in 2022 (WBCSD, 2025). The platform automatically flagged anomalies and fed verified data into Unilever's Scope 3 inventory.

Procter & Gamble adopted a parallel model through its Supplier Environmental Sustainability Scorecard, requiring its top 400 suppliers to disclose Scope 1 and 2 emissions through CDP Supply Chain by 2024 and linking scorecard performance to preferred supplier status (P&G, 2025). Nestlé pursued a different approach through its Income Accelerator program, which provided direct cash incentives to smallholder dairy and cocoa farmers for adopting regenerative practices that also reduced methane and nitrous oxide emissions (Nestlé, 2024).

Results and Impact

Unilever reported in its 2025 Annual Report that absolute Scope 3 emissions from purchased goods and services fell 47 percent from the 2021 baseline, on track for the stated 50 percent reduction target by year-end 2026. Key metrics include:

• Renewable energy adoption: 38 percent of the top 300 suppliers had transitioned to at least 50 percent renewable electricity by mid-2025, compared with 11 percent in 2021.
• Primary data coverage: Product carbon footprints based on supplier-specific data covered 42 percent of procurement spend, improving inventory accuracy by an estimated 30 percent relative to spend-based methods (WBCSD, 2025).
• Supplier target-setting: 67 percent of emissions-weighted suppliers had set science-based targets, meeting the SBTi Corporate Net-Zero Standard requirement two years ahead of the 2027 deadline.
• Financial performance: Suppliers enrolled in the Partner with Purpose program reported average energy cost savings of 14 percent within 18 months, partially offsetting the capital expenditure required for upgrades (Carbon Trust, 2025).

Procter & Gamble reported a 30 percent reduction in Scope 3 Category 1 emissions intensity per unit of production between 2020 and 2025. Nestlé disclosed that its Income Accelerator pilot in Switzerland and Côte d'Ivoire reduced per-farm emissions by 20 percent while increasing farmer incomes by 12 percent (Nestlé, 2025).

Lessons Learned

Start with data, not targets. Unilever found that setting ambitious Scope 3 targets before establishing primary data pipelines led to credibility challenges. The shift to activity-based accounting in 2023 revealed that some categories had been over-estimated while others were significantly under-counted.

Commercial incentives outperform compliance mandates. Suppliers responded more strongly to volume guarantees and longer contracts than to audit-based compliance requirements. When decarbonization was framed as a commercial advantage rather than a cost center, participation rates increased threefold.

Tier 2 and Tier 3 engagement requires intermediaries. Direct engagement with thousands of smallholder farmers and chemical feedstock processors was impractical. Partnerships with organizations such as Rainforest Alliance for palm oil and the Sustainable Agriculture Initiative (SAI) Platform for dairy enabled scalable outreach to deeper supply tiers.

Measurement rigor builds stakeholder trust. Third-party verification of supplier data by organizations such as the Carbon Trust gave investors and regulators confidence in reported reductions. Unilever's inclusion in the Climate Action 100+ Net Zero Company Benchmark as an "aligned" company in 2025 was directly attributed to the quality of its Scope 3 measurement infrastructure.

Regional context matters. Energy grids in Southeast Asia and Sub-Saharan Africa are more carbon-intensive, meaning that supplier electrification alone does not deliver the same reductions as in Europe. Unilever addressed this by co-investing in on-site solar installations and biogas systems tailored to local conditions.

Key Players

Established Leaders

• Unilever — Pioneer of structured supplier decarbonization with the Partner with Purpose program covering 600+ suppliers across 34 countries.
• Procter & Gamble — Deployed the Supplier Environmental Sustainability Scorecard integrating carbon metrics into procurement decisions for its top 400 suppliers.
• Nestlé — Launched the Income Accelerator program linking farmer cash incentives to regenerative practice adoption and emissions reduction.
• WBCSD (Partnership for Carbon Transparency) — Developed the PACT framework enabling standardized product carbon footprint data exchange across supply chains.

Emerging Startups

• Pledge — SaaS platform providing automated Scope 3 emissions measurement and supplier engagement tools for consumer goods companies.
• Altruistiq — Sustainability data platform used by FMCG brands to collect, verify, and report supplier-level carbon data.
• Emitwise — AI-powered carbon accounting platform specializing in supply chain emissions with primary data integration capabilities.
• Plan A — End-to-end decarbonization platform helping companies set science-based targets and track supplier progress.

Key Investors/Funders

• Breakthrough Energy Ventures — Bill Gates-backed fund investing in supply chain decarbonization technologies and platforms.
• Climate Action 100+ — Investor coalition engaging the world's largest corporate emitters on net-zero transition plans including Scope 3 strategies.
• IKEA Foundation — Funding renewable energy access programs for smallholder suppliers in emerging markets.

Action Checklist

• Map your Scope 3 hotspots using lifecycle assessment data and identify the top suppliers responsible for 70 percent or more of upstream emissions.
• Segment suppliers by decarbonization maturity and develop tailored engagement pathways for leaders, middle-of-the-pack, and laggards.
• Invest in a primary data collection platform aligned with the PACT framework or equivalent standard to replace spend-based emission factors.
• Integrate carbon intensity metrics into supplier scorecards with a weighting of at least 15 percent, escalating over time.
• Offer commercial incentives such as longer contract terms, volume guarantees, and co-funded energy audits to suppliers that meet decarbonization milestones.
• Partner with industry organizations and NGOs to reach Tier 2 and Tier 3 suppliers in high-impact categories such as agriculture and chemicals.
• Commission third-party verification of supplier emission data to build credibility with investors, regulators, and customers.
• Report progress annually using recognized frameworks (CDP Supply Chain, SBTi progress reports) and disclose both absolute and intensity-based metrics.

FAQ

How long does it take to see measurable Scope 3 reductions from supplier programs? Most companies report meaningful results within two to three years of launching structured supplier engagement. Unilever began its phased approach in 2021 and reported a 47 percent reduction by 2025. However, the initial 12 to 18 months are typically spent building data infrastructure and enrolling suppliers rather than achieving reductions.

What is the cost of implementing a supplier decarbonization program? Costs vary widely depending on supply chain complexity. Unilever's Partner with Purpose program involved co-funding energy audits at approximately $5,000 to $15,000 per supplier site, plus platform development costs. The Carbon Trust (2025) estimates that large FMCG companies should budget 0.1 to 0.3 percent of procurement spend for supplier engagement in the first three years. Suppliers themselves reported average energy cost savings of 14 percent within 18 months, improving the business case over time.

Can small and mid-sized companies replicate this approach? Yes, though at a different scale. Smaller companies can leverage existing platforms such as CDP Supply Chain (which costs from $11,000 per year for SMEs) and industry coalitions like the Supplier Leadership on Climate Transition (Supplier LoCT) initiative by WBCSD. Collaborative procurement groups allow smaller buyers to pool resources and share technical assistance costs.

How do you handle suppliers that refuse to participate? Unilever used a phased approach: initial engagement through education and incentives, followed by scorecard integration that affected contract decisions. Suppliers that showed no progress after two review cycles were flagged for potential phase-out. P&G took a similar approach, making CDP Supply Chain disclosure a prerequisite for preferred supplier status by 2025. The key is to combine carrots (commercial incentives) with credible sticks (procurement consequences).

What role does regulation play in driving supplier engagement? Regulation is accelerating adoption. The EU Corporate Sustainability Due Diligence Directive (CSDDD), effective from 2026, requires large companies to identify and address environmental impacts across their value chains. California's SB 253 mandates Scope 3 disclosure for companies with revenues above $1 billion. These requirements are shifting supplier engagement from voluntary to compliance-driven, creating a level playing field.

Sources

• CDP. (2025). Global Supply Chain Report 2025: Scope 3 Disclosure and Supplier Engagement Trends. CDP Worldwide.
• Unilever. (2024). Climate Transition Action Plan 2024. Unilever PLC.
• Unilever. (2025). Annual Report and Accounts 2025: Sustainability Performance Data. Unilever PLC.
• McKinsey & Company. (2024). Decarbonizing Consumer Goods Supply Chains: Supplier Perspectives and Barriers. McKinsey Sustainability.
• Boston Consulting Group. (2025). The Data Gap in Scope 3: FMCG Supplier Measurement Readiness. BCG.
• Carbon Trust. (2025). Energy Transition in Consumer Goods Supply Chains: Programme Evaluation and Cost-Benefit Analysis. The Carbon Trust.
• WBCSD. (2025). Partnership for Carbon Transparency (PACT): Adoption Report and Primary Data Coverage Benchmarks. World Business Council for Sustainable Development.
• Procter & Gamble. (2025). Environmental Sustainability Report 2025: Supplier Scorecard and Scope 3 Progress. P&G.
• Nestlé. (2024). Creating Shared Value and Sustainability Report 2024: Income Accelerator Results. Nestlé S.A.
• Nestlé. (2025). Progress Report on Net Zero Roadmap: Supplier Engagement and Farm-Level Emissions. Nestlé S.A.
• SBTi. (2024). Corporate Net-Zero Standard Version 2.0: Scope 3 Requirements and Supplier Engagement Thresholds. Science Based Targets initiative.