Measure Supply Chain Carbon. Improve ESG Performance. Drive Decarbonisation.

Scope 3 Emissions

Mainer Associates helps organisations understand, measure and reduce Scope 3 greenhouse gas emissions through practical carbon accounting, ESG consultancy and digital carbon management solutions.

As Scope 3 emissions often represent the largest proportion of an organisation’s carbon footprint, accurate measurement and effective reduction strategies are increasingly critical for ESG reporting, net zero targets, investor requirements and supply chain resilience.

Through our consultancy services and CarbonCentric carbon management platform, we help businesses simplify carbon data collection, improve reporting accuracy and identify meaningful decarbonisation opportunities across their value chain.

What are Scope 3 Emissions?

Scope 3 emissions are indirect greenhouse gas emissions generated throughout an organisation’s value chain. Unlike Scope 1 and Scope 2 emissions, Scope 3 includes emissions associated with suppliers, purchased goods and services, business travel, employee commuting, waste, transportation, investments and product life cycle impacts.

Under the Greenhouse Gas Protocol, Scope 3 emissions are divided into 15 categories covering both upstream and downstream activities.

For many organisations, Scope 3 emissions account for more than 70% of total carbon emissions, making them a critical component of net zero and ESG strategies.

Understanding Scope 3 emissions helps organisations:

  • Improve carbon reporting and ESG transparency

  • Meet investor and stakeholder expectations

  • Support net zero and science-based targets

  • Identify supply chain carbon hotspots

  • Improve procurement and operational decision-making

  • Prepare for evolving disclosure requirements including SECR, CSRD and ISSB reporting frameworks

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Our Approach

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  • We calculate and assess Scope 3 emissions across relevant categories using recognised methodologies aligned with the GHG Protocol and international reporting standards.

  • Our consultants help organisations identify high-impact suppliers, procurement risks and carbon-intensive activities across their value chain.

  • We integrate Scope 3 reporting into wider ESG, sustainability and decarbonisation strategies to support long-term carbon reduction goals.

  • We support businesses in developing practical carbon data collection processes, supplier engagement strategies and reporting structures.

  • Our team identifies realistic carbon reduction opportunities linked to procurement, operations, travel, logistics and embodied carbon impacts.

  • We help organisations align reporting with frameworks including:

    • GHG Protocol

    • SECR

    • CSRD

    • ISSB

    • TCFD

    • Net Zero and Science-Based Targets initiatives

CarbonCentric: Carbon Management Platform

To support ongoing carbon management and ESG reporting, Mainer Associates works alongside CarbonCentric - a digital carbon management platform designed to simplify emissions tracking and reporting.

By combining consultancy expertise with digital reporting tools, we help organisations move beyond one-off carbon assessments towards continuous carbon management and measurable improvement.

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Our Approach

  • Practical & Commercially Focused

    We provide realistic, actionable carbon strategies tailored to organisational operations, supply chains and reporting requirements.

  • Data-Led Decision Making

    Our approach focuses on improving data quality, reporting accuracy and long-term carbon visibility across the organisation.

  • Integrated ESG Expertise

    Scope 3 emissions are closely linked to wider ESG objectives. Our multidisciplinary sustainability expertise enables joined-up carbon, ESG and compliance strategies.

  • Collaborative Supply Chain Engagement

    We work closely with procurement teams, suppliers and stakeholders to improve emissions data and support practical reduction initiatives.

  • Long-Term Carbon Management

    Through CarbonCentric and ongoing consultancy support, we help organisations establish scalable systems for continuous carbon management and reporting improvement.

Why Choose Mainer?

  • Experienced carbon and ESG consultants

  • Practical Scope 3 measurement and reporting support

  • Integrated consultancy and digital platform solutions

  • Expertise across net zero, ESG and carbon compliance

  • Collaborative, commercially focused approach

  • Support for ongoing carbon management and reporting

Frequently Asked Questions

  • Scope 3 emissions are indirect emissions generated throughout an organisation’s value chain, including suppliers, transportation, business travel, waste and purchased goods and services.

  • For many organisations, Scope 3 emissions represent the largest portion of total carbon emissions and are increasingly required within ESG disclosures, investor reporting and net zero strategies.

  • Scope 3 emissions are typically measured using spend-based data, activity-based calculations, supplier-specific data and recognised emission factors aligned with the GHG Protocol.

  • The main challenges are often data availability, supply chain engagement and reporting consistency across large or complex value chains.

  • Yes. CarbonCentric helps organisations centralise emissions data, track Scope 1, 2 and 3 emissions and improve ongoing carbon reporting and management processes.

  • Mainer Associates provides Scope 3 emissions assessments, ESG consultancy, decarbonisation strategies and ongoing carbon management support through CarbonCentric.