Scope 3 emissions often represent the largest portion of an organisations carbon footprint, yet they remain the most challenging to measure and manage. These indirect emissions occur throughout the value chain, from raw material extraction to product end-of-life. Understanding and addressing Scope 3 emissions is essential for organisations committed to meaningful climate action. This comprehensive guide provides practical approaches for identifying, measuring, and managing Scope 3 emissions effectively.
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This guide is part of our series.
Understanding Scope 3 Emissions
Scope 3 emissions are all indirect emissions that occur in the value chain of the reporting organisation. They include both upstream and downstream emissions that are not directly controlled by the organisation. The Greenhouse Gas Protocol categorises Scope 3 into 15 distinct categories, providing a comprehensive framework for understanding these emissions.
For most organisations, Scope 3 emissions far exceed direct emissions (Scope 1) and purchased electricity emissions (Scope 2). Research indicates that for many businesses, Scope 3 can represent 80-90% of total carbon footprint. This makes Scope 3 management essential for meaningful climate action.
Scope 3 emissions arise from activities that the organisation does not directly control but influences through its purchasing decisions, product design, and customer relationships. Managing these emissions requires engagement with suppliers, customers, and other value chain partners.
Scope 3 Categories
The Greenhouse Gas Protocol identifies 15 Scope 3 categories, divided into upstream and downstream emissions.
Upstream Categories
Upstream Scope 3 emissions arise from activities in the supply chain. These include purchased goods and services, capital goods, fuel and energy activities, upstream transportation and distribution, waste generated in operations, business travel, employee commuting, and upstream leased assets.
Purchased goods and services typically represent the largest upstream category for most organisations. These emissions arise from production of goods and services purchased by the reporting organisation. The complexity of supply chains means these emissions can be difficult to quantify.
Capital goods emissions arise from production of purchased equipment, machinery, and other capital items. These emissions can be significant for capital-intensive industries.
Upstream transportation and distribution emissions arise from transportation and distribution of purchased inputs in vehicles not owned or controlled by the organisation. This includes shipping, trucking, and other freight activities.
Downstream Categories
Downstream Scope 3 emissions arise from activities related to products after they leave the organisation. These include downstream transportation and distribution, processing of sold products, use of sold products, end-of-life treatment of sold products, downstream leased assets, franchised operations, and investments.
Use of sold products often represents the largest downstream category, particularly for organisations selling products that consume energy or produce emissions during use. This category can be extremely large for organisations selling vehicles, appliances, or other energy-consuming products.
End-of-life treatment of sold products includes emissions from disposal, recycling, or other treatment of products at the end of their useful life. This category is particularly relevant for products with significant packaging or materials that may end up in landfill.
Why Scope 3 Matters
Scope 3 emissions matter for several important reasons that affect organisational strategy, reputation, and regulatory compliance.
Climate Impact
For most organisations, Scope 3 represents the vast majority of climate impact. Addressing only Scope 1 and Scope 2 emissions leaves the most significant impacts unmanaged. Meaningful climate action requires addressing the full value chain footprint.
Climate science makes clear that limiting warming to 1.5 degrees requires rapid emission reductions across all sources. Organisations that ignore Scope 3 cannot claim credible climate leadership.
Regulatory Requirements
Regulatory requirements are increasingly including Scope 3 emissions. Australias mandatory climate disclosure, based on TCFD recommendations, requires disclosure of material Scope 3 emissions. The ISSB standards similarly require Scope 3 disclosure where material.
Regulatory scope is likely to expand as policymakers seek to address full value chain emissions. Organisations that develop Scope 3 capabilities early will be better positioned for compliance.
Stakeholder Expectations
Investors, customers, and other stakeholders increasingly expect organisations to address Scope 3 emissions. Investor pressure on climate disclosure includes Scope 3. Customers are increasingly considering environmental impacts in purchasing decisions.
Supply chain sustainability has become a procurement criterion for many large organisations. Suppliers that cannot demonstrate Scope 3 management may lose business to competitors with stronger credentials.
Business Risks
Scope 3 emissions create business risks that require management. Supply chain disruptions, regulatory changes, and shifting customer preferences can all affect organisations through their value chain relationships.
Climate transition risks particularly affect Scope 3. As carbon pricing expands and low-carbon alternatives emerge, organisations with high Scope 3 exposure may face cost increases and competitive disadvantages.
Identifying Scope 3 Emissions
The first step in Scope 3 management is identifying which categories are relevant and significant. Not all 15 categories will be material for every organisation.
Relevance Assessment
Organisations should assess which Scope 3 categories are relevant based on business activities. Relevance criteria include emissions magnitude, stakeholder concern, risk exposure, and outsourcing decisions.
Categories that represent less than 1% of total Scope 3 may be excluded, provided this is disclosed. However, organisations should be cautious about exclusions as some small categories may become significant.
Data Availability
Data availability affects the feasibility of measuring different categories. Some categories have readily available data while others require substantial estimation or engagement with value chain partners.
Categories with available data should be prioritised for initial measurement. Categories requiring supplier engagement can be addressed over time as relationships develop.
Prioritisation
Organisations should prioritise categories based on significance and manageability. Categories that are both significant and addressable should receive priority attention.
Significance considers both emissions magnitude and impact potential. Manageability considers organisational ability to influence emissions through business relationships.
Measuring Scope 3 Emissions
Scope 3 measurement can use various approaches depending on data availability and accuracy requirements.
Calculation Methods
Calculation methods for Scope 3 include spend-based methods, average data methods, and supplier-specific methods. Selection depends on data availability and desired accuracy.
Spend-based methods use economic values and industry average emission factors. These methods are useful when specific data is unavailable but require significant estimation.
Average data methods use industry average emission factors per unit of activity. Activity data might include units purchased, distance shipped, or weight of materials.
Supplier-specific methods use actual emission data from suppliers. These methods provide highest accuracy but require supplier cooperation and data sharing.
Data Sources
Scope 3 calculation requires activity data and emission factors. Both can be obtained from various sources.
Activity data comes from internal records, supplier information, and industry databases. Procurement records, transportation logs, and product sales data all provide relevant activity information.
Emission factors come from published databases, industry associations, and suppliers. The GHG Protocol, government databases, and commercial providers all offer emission factor data.
Supplier Engagement
Supplier engagement is essential for accurate Scope 3 measurement. Direct supplier data provides much higher accuracy than estimation approaches.
Supplier questionnaires gather emissions data from key suppliers. questionnaires should specify required data formats and calculation methodologies.
Supplier development programs help suppliers build emissions measurement capability. Many suppliers, particularly smaller ones, lack capability to measure and report emissions.
Industry collaboration can accelerate supplier engagement. Collective approaches share costs and create common expectations across supply chains.
Managing Scope 3 Emissions
Measurement is only the first step. Effective Scope 3 management requires actions to reduce emissions throughout the value chain.
Supply Chain Engagement
Working with suppliers is the most effective way to reduce upstream Scope 3 emissions. Engagement can include supplier requirements, capability building, and collaborative improvement programs.
Supplier codes of conduct can establish emission expectations. Requirements should be specific and measurable, with clear consequences for non-compliance.
Supplier development programs build capability for emissions measurement and reduction. Support may include training, tools, and technical assistance.
Product Design
Product design affects downstream Scope 3 emissions significantly. Design decisions about materials, energy efficiency, and durability all affect product carbon footprints.
Life cycle assessment helps understand product environmental impacts. Assessment tools identify hotspots where design changes can have greatest impact.
Design for environment principles guide decisions about materials selection, manufacturing processes, packaging, and end-of-life treatment.
Customer Engagement
Organisations can influence downstream emissions through customer relationships. Product labelling, usage guidance, and end-of-life programs all affect how customers use and dispose of products.
Product carbon labelling helps customers make informed choices. Labels should be accurate, understandable, and comparable across products.
Customer education programs can influence product use. Guidance on efficient use, maintenance, and disposal extends product life and reduces environmental impact.
Investment Decisions
Investment decisions affect Scope 3 through capital goods purchases and infrastructure choices. Low-carbon investments can reduce future Scope 3 emissions.
Procurement policies should consider emissions from capital goods. Purchasing decisions can influence supplier practices through market signals.
Infrastructure decisions, particularly around energy systems, affect long-term emissions profiles. Clean energy investments reduce both operational and supply chain emissions.
Setting Scope 3 Targets
Effective Scope 3 management includes setting targets that drive improvement over time.
Target Types
Scope 3 targets can be absolute or intensity-based. Absolute targets specify total emission reductions. Intensity targets relate emissions to business activity.
Absolute targets are aligned with climate science and Paris Agreement goals. They specify real emission reductions that contribute to limiting warming.
Intensity targets allow for growth while improving efficiency. However, they may not deliver absolute reductions needed for climate goals.
Science-Based Targets
Science-based targets ensure emission reductions are aligned with climate science. The Science Based Targets initiative provides methodologies for setting Scope 3 targets.
SBTi requires that Scope 3 targets cover at least 67% of upstream and downstream emissions. This ensures comprehensive coverage rather than selective attention.
Supplier engagement targets can drive supply chain action. Targets for supplier emissions measurement and reduction create accountability throughout value chains.
Target Setting Process
Target setting should follow a systematic process. This includes baseline measurement, stakeholder engagement, and commitment development.
Baseline measurement establishes the reference point for target setting. Baselines should use accurate data and appropriate methodological approaches.
Stakeholder engagement builds support for targets. Internal alignment and external communication both support successful target achievement.
Commitment development creates accountability. Public commitments create pressure that supports implementation.
Reporting Scope 3 Emissions
Transparent reporting builds credibility and demonstrates commitment to stakeholders.
Disclosure Requirements
Mandatory disclosure requirements increasingly include Scope 3. Australias TCFD-aligned requirements and ISSB standards both require Scope 3 disclosure where material.
Disclosure should follow recognised frameworks. The CDP, GRI, and SASB all provide reporting guidance relevant to Scope 3.
Assurance over Scope 3 data enhances credibility. Limited assurance is common; reasonable assurance is emerging as best practice.
Reporting Best Practices
Best practice reporting includes methodology disclosure, data quality discussion, and year-on-year comparison. Transparency about limitations builds credibility.
Reporting should include both absolute emissions and context. Intensity metrics, reduction progress, and target performance all provide useful context.
Forward-looking information demonstrates commitment. Planned actions, expected reductions, and milestone targets all show credible commitment to improvement.
Conclusion
Scope 3 emissions represent the largest portion of most organisations carbon footprints. Effective climate action requires addressing these emissions through systematic measurement, targeted management, and transparent reporting.
For more information on Scope 3 emissions management, visit our resource page.