Sustainable supply chain

A sustainable supply chain is the management of every stage of sourcing, production and distribution in a way that minimises negative environmental, social and economic impacts, while keeping the business commercially viable. Instead of optimising only for cost and speed, it weighs greenhouse gas emissions, resource use, labour conditions and ethics across the whole chain of suppliers and partners.

It has become a central topic for companies because the bulk of a typical organisation's impact, and increasingly its legal obligations, sits not inside its own walls but across its value chain. Measuring and reducing the carbon footprint of that chain is one of the main reasons companies invest in supply chain sustainability.

What a sustainable supply chain involves

A sustainable supply chain is a comprehensive approach that balances economic needs with environmental and social responsibility. In practice it means working on factors such as:

• Reducing greenhouse gas (GHG) emissions at every stage, from raw materials to end-of-life.
• Efficient use of natural resources (energy, water and materials).
• Selecting and developing suppliers that meet sustainability standards.
• Respecting labour and human rights throughout the chain.
• Applying ethical and transparent business practices, including traceability.

Beyond the environmental gains, a sustainable supply chain can give companies competitive advantages: a stronger reputation, access to new markets and customers, greater resilience to disruption, and lower exposure to tightening environmental and human rights regulation.

The link with the carbon footprint

A carbon footprint measures the total GHG emissions generated directly or indirectly by an activity, product or service. Following the GHG Protocol, supply chain emissions are split into Scope 1 (direct), Scope 2 (purchased energy) and Scope 3 (all other indirect emissions in the value chain).

A sustainable supply chain focuses above all on Scope 3, because for most companies it dominates the total footprint. According to the CDP and BCG report Scope 3 Upstream: Big Challenges, Simple Remedies (2024), companies' upstream supply chain emissions are on average around 26 times higher than their direct operational emissions. This is why credible decarbonisation is impossible without engaging suppliers.

Benefits of measuring and managing supply chain emissions

Measuring emissions across the chain lets companies see where the impact really is and act on it. The main benefits include:

• Process optimisation: spotting inefficiencies in sourcing, transport and logistics cuts both cost and emissions.
• Regulatory readiness: EU rules increasingly require transparency on value chain impacts, from sustainability reporting to due diligence (see below).
• Reputation: customers, investors and other stakeholders value a demonstrable commitment to sustainability.
• Access to finance: many lenders and investors favour companies with credible, well-documented sustainable supply chains.

How to build a sustainable supply chain

Making a supply chain sustainable requires a strategic and collaborative approach. The most common levers are:

1. Selecting and developing sustainable suppliers

Set clear sustainability criteria for procurement, for example the use of renewable energy or certification under environmental management standards such as ISO 14001. Support, rather than simply audit, suppliers so they can improve.

2. Data, digitalisation and traceability

Collecting primary data from suppliers and digitalising the chain make it possible to measure real emissions instead of relying on generic averages, and to identify priority areas for improvement.

3. Collaboration with strategic partners

Supply chain sustainability cannot be achieved in isolation. Working with suppliers, customers, industry peers and non-governmental organisations is essential to develop shared solutions that reduce emissions and improve practices.

4. Emission reduction plans aligned with science

Define specific reduction plans for each stage of the chain, aligned with global climate goals such as the Paris Agreement and, ideally, with science-based targets. A structured low-carbon supply chain strategy turns these goals into concrete supplier-level actions.

Regulation and standards

Several frameworks guide companies in making their supply chains more sustainable:

• GHG Protocol: the most widely used methodology for measuring and managing GHG emissions, including Scope 3.
• ISO 20400: international guidance on sustainable procurement, setting principles for integrating sustainability into purchasing.
• EU Taxonomy: defines criteria for environmentally sustainable economic activities, used as a reference for sustainable sourcing and finance.

The most important recent development is the Corporate Sustainability Due Diligence Directive (CSDDD). After being simplified by the Omnibus I package (Directive (EU) 2026/470, published in the Official Journal on 26 February 2026), the CSDDD applies to very large companies with more than 5,000 employees and over EUR 1.5 billion in global turnover. It adopts a risk-based approach, so companies focus on where adverse impacts are most likely and most severe rather than mapping the entire value chain. Member States must transpose it by 26 July 2028, with the first obligations applying from 26 July 2029. You can read more in our entry on the Corporate Sustainability Due Diligence Directive (CSDDD).

The role of technology

Technology is a key enabler. Data analytics platforms and, increasingly, artificial intelligence help companies collect supplier data, calculate Scope 3 emissions and model reduction scenarios far more efficiently than manual methods, making the chain more measurable and transparent.

At Manglai we help companies measure the carbon footprint of their operations and supply chain, manage Scope 3 emissions and prepare their sustainability reporting. Discover how Manglai can help you.