Measuring Value Chain Emissions with Confidence

For many organisations, Scope 3 emissions represent the largest proportion of their greenhouse gas (“GHG”) emissions. Unlike Scope 1 and Scope 2 emissions, which arise from an organisation’s own operations and purchased energy, Scope 3 emissions occur throughout the wider value chain, from purchased goods and business travel to transportation, waste management and investments.

Although Scope 3 emissions are often the most significant source of an organisation’s carbon footprint, they are also the most challenging to measure. Data is frequently spread across multiple departments, suppliers and business partners, making accurate emissions accounting both complex and resource-intensive.

GreenCo helps organisations develop practical and reliable approaches to Scope 3 accounting, enabling companies to improve the quality of their climate disclosures while identifying opportunities to reduce emissions across the value chain.

Why Scope 3 Emissions Matter?

As sustainability reporting continues to evolve, organisations are increasingly expected to understand not only the emissions generated from their own operations, but also those arising throughout their value chain.

Understanding Scope 3 emissions can help organisations:

  • Develop a more complete GHG inventory
  • Identify major emissions hotspots across the value chain
  • Strengthen climate-related disclosures
  • Respond to investor, customer and supply chain expectations
  • Support decarbonisation and Net Zero strategies
  • Improve supplier engagement and ESG data management
  • Prepare for evolving sustainability reporting requirements

For many organisations, Scope 3 emissions account for the majority of their total GHG emissions, making them a critical component of long-term climate strategies.

Understanding the 15 Scope 3 Categories

The GHG Protocol groups Scope 3 emissions into fifteen reporting categories covering both upstream and downstream activities.

These include:

Upstream Activities

  • Purchased goods and services

  • Capital goods

  • Fuel- and energy-related activities

  • Upstream transportation and distribution

  • Waste generated in operations

  • Business travel

  • Employee commuting

  • Upstream leased assets

Downstream Activities

  • Downstream transportation and distribution

  • Processing of sold products

  • Use of sold products

  • End-of-life treatment of sold products

  • Downstream leased assets

  • Franchises

  • Investments

Not every category is relevant to every organisation.

GreenCo helps clients determine which categories are applicable based on their business model, industry characteristics and reporting objectives.

Common Scope 3 Challenges

Compared with Scope 1 and Scope 2 emissions, Scope 3 accounting presents significantly greater technical and operational challenges.

Organisations commonly encounter issues such as:

  • Determining which Scope 3 categories are applicable
  • Limited availability of supplier emissions data
  • Difficulty selecting appropriate calculation methodologies
  • Inconsistent activity data across departments
  • Balancing data accuracy with practical resource constraints
  • Maintaining supporting evidence for future assurance
  • Managing changes in reporting boundaries and methodologies over time

GreenCo helps organisations address these challenges through a structured and practical approach that balances technical robustness with operational feasibility.

Our Scope 3 Advisory Services

GreenCo provides comprehensive advisory services covering every stage of the Scope 3 accounting process.

Scope 3 Screening Assessment
We help organisations identify which Scope 3 categories are applicable and prioritise categories likely to contribute the greatest emissions.
Boundary Setting and Category Selection
Our consultants establish appropriate organisational and operational boundaries while determining the Scope 3 categories relevant to your business activities.
Data Collection and Supplier Engagement
We support organisations in developing practical data collection templates, coordinating information requests and improving supplier engagement to obtain reliable emissions data.
Emissions Calculation
GreenCo applies recognised calculation methodologies under the GHG Protocol, using appropriate activity data, emission factors and estimation techniques where necessary.
Quality Review and Assurance Readiness
We review calculations, supporting documentation and data quality to strengthen reporting confidence and improve readiness for future assurance requirements.
Climate Reporting Support
Scope 3 emissions data can be incorporated into sustainability reports, climate-related disclosures, investor communications and decarbonisation planning.

Our Four-Step Methodology

Step 1 – Screening and Planning

Identify relevant Scope 3 categories, establish reporting boundaries and determine data collection priorities.

Step 2 – Data Collection

Collect activity data from internal departments, suppliers and other relevant stakeholders using practical and structured reporting templates.

Step 3 – Emissions Calculation and Analysis

Calculate emissions using recognised GHG Protocol methodologies, identify major emissions hotspots and evaluate data quality.

Step 4 – Reporting and Improvement

Prepare Scope 3 emissions disclosures together with practical recommendations for improving data quality, supplier engagement and future reporting processes.

Why Choose GreenCo?

Scope 3 accounting requires more than technical calculations, it requires an understanding of business operations, supply chains and evolving sustainability reporting expectations.

GreenCo has extensive experience supporting listed companies across Hong Kong and Singapore with GHG accounting, sustainability reporting and climate-related disclosures.

Our strengths include:

  • Practical application of the GHG Protocol across diverse industries
  • Experience supporting Scope 3 reporting for listed companies
  • Expertise in HKEX, SGX, GRI and IFRS Sustainability Disclosure Standards
  • Strong capabilities in supplier engagement and ESG data management
  • Support for assurance readiness and emissions data governance
  • Tailored methodologies designed around each organisation’s business model

Whether your organisation is preparing Scope 3 disclosures for the first time or seeking to enhance an existing emissions inventory, GreenCo provides practical solutions that balance reporting quality with operational efficiency.

Transform Scope 3 Data into Climate Action

Scope 3 emissions often represent the greatest opportunity for organisations to reduce their overall carbon footprint and strengthen climate resilience.

By understanding emissions across the value chain, organisations can make better-informed decisions, engage suppliers more effectively and develop targeted decarbonisation strategies that support long-term sustainability goals.

Contact GreenCo today to discuss how our Scope 3 Emissions Advisory services can support your organisation’s climate reporting and carbon management journey.

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