How to set carbon reduction requirements for suppliers

The goods and services an organisation buys can contribute to its wider environmental impact, making supplier engagement an important part of carbon reduction. Setting clear supplier carbon requirements can help businesses gather better information, understand supply chain emissions and encourage meaningful environmental action.

However, requirements need to be proportionate, relevant and supported by evidence. This guide explains how businesses can set practical carbon reduction requirements for suppliers and use them to support wider sustainability objectives.

Key takeaways

• Supplier carbon requirements should be relevant, measurable and proportionate to the goods or services being purchased.
• Carbon data, reduction plans and supporting evidence can help businesses assess supplier environmental performance.
• Supplier requirements work best as part of wider supply chain engagement and carbon reduction activity.

Why supplier carbon requirements matter

A business's environmental impact is not limited to emissions generated directly within its own operations.

Green Economy identifies supplier choices as an important consideration for organisations working towards net zero, particularly because procurement decisions can affect Scope 3 emissions, transport, packaging and the wider impact of products and services.

Setting appropriate requirements gives businesses a structured way to understand how suppliers are managing carbon and where further engagement may be needed.

It can also provide more useful information for supply chain analysis and wider carbon reduction planning.

Start by understanding your own supply chain

Before introducing requirements, businesses should understand which suppliers and purchasing activities have the greatest relevance to their environmental impact.

Not every supplier will have the same carbon impact or require the same level of scrutiny.

Supply chain mapping can help businesses identify important relationships and understand where Scope 3 emissions occur. Green Economy provides tailored supply chain analysis to help organisations measure and report Scope 3 emissions, alongside advice and training to support supply chain engagement.

This information can help businesses focus requirements on areas where supplier action can make a meaningful difference.

Decide what you need suppliers to provide

Supplier carbon requirements should have a clear purpose.

Depending on the organisation and procurement activity, businesses may ask suppliers for information such as:

• greenhouse gas emissions data
• carbon reduction plans
• environmental policies
• carbon reduction targets
• evidence of progress against environmental objectives
• information about relevant products, materials or services
• evidence supporting environmental claims

The information requested should help the business make better procurement or carbon reduction decisions.

Asking for information without knowing how it will be assessed can create unnecessary work for both buyers and suppliers.

Ask for evidence, not just commitments

Broad environmental commitments can be useful, but they provide limited insight without supporting evidence.

Green Economy advises businesses assessing sustainable suppliers to consider how suppliers evidence their sustainability claims and whether their targets are measurable and time-bound. It also warns against treating sustainability as a simple tick-box exercise or relying too heavily on a single claim or accreditation.

Where appropriate, businesses can ask suppliers to provide data or documentation showing how environmental performance is measured and improved.

This creates a stronger basis for comparing responses and understanding whether commitments are translating into action.

Consider carbon reduction plans

A carbon reduction plan can provide useful evidence of how a supplier intends to reduce its emissions over time.

Businesses may want to understand whether suppliers have identified their emissions, established reduction priorities and developed practical actions.

Green Economy's sustainability services include support for developing environmental policies and carbon reduction plans, particularly where businesses need to demonstrate environmental credentials to customers and wider supply chains.

Requirements should still reflect the nature and significance of the supplier relationship rather than expecting every supplier to provide the same level of information.

Make requirements proportionate

Supplier carbon requirements should support better decisions without creating unnecessary complexity.

A large or carbon-intensive supplier may justify more detailed questions than a supplier responsible for a relatively small part of the organisation's environmental impact.

Businesses should consider factors such as:

• the value and nature of the contract
• potential environmental impact
• relevance to Scope 3 emissions
• importance of the supplier to operations
• availability of reliable carbon information

A proportionate approach can make supplier engagement more manageable while keeping attention on the areas with the greatest potential impact.

Include sustainability in procurement decisions

Carbon requirements are most useful when the information collected influences decision-making.

Businesses can consider environmental performance alongside factors such as cost, quality, capability and operational requirements when assessing potential suppliers.

Green Economy recommends looking beyond price alone when choosing sustainable suppliers, as a cheapest-first approach can overlook environmental risks and other impacts elsewhere in the supply chain.

The aim is not necessarily to select the supplier reporting the lowest emissions. It is to understand the available evidence and make a more informed decision based on the needs and objectives of the business.

Engage suppliers rather than relying on questionnaires alone

Collecting information is only one part of effective supplier engagement.

Questionnaires can provide useful evidence, but businesses also need to understand what responses mean and how suppliers intend to improve.

Engagement can help organisations clarify information, discuss carbon reduction opportunities and understand where suppliers may need additional time or support.

Green Economy's consultancy offer includes advice and training to help businesses engage with their supply chains, alongside supply chain analysis for Scope 3 emissions.

This can help turn supplier requirements into an ongoing process of environmental improvement.

Review supplier requirements over time

Carbon reduction requirements should evolve as a business develops its understanding of supply chain emissions.

Early requirements may focus on establishing whether suppliers measure emissions or have environmental policies in place. As data and capabilities improve, businesses may be able to introduce more detailed expectations.

Supplier performance and the quality of information provided should also be reviewed periodically.

This allows businesses to improve their approach without making the procurement process unnecessarily complicated from the outset.

Common mistakes when setting supplier carbon requirements

Businesses can make supplier requirements less effective by asking for information without a clear strategy for using it.

Common mistakes include:

• applying identical requirements to every supplier
• accepting unsupported environmental claims
• focusing on a single certification or credential
• collecting carbon data without assessing its relevance
• overlooking suppliers further along the supply chain
• treating supplier engagement as a one-off exercise

A focused approach helps businesses collect information that supports practical procurement and carbon reduction decisions.

What businesses should do next

Businesses should begin by understanding their supply chain and identifying the suppliers or purchasing categories that have the greatest relevance to their environmental impact.

From there, organisations can decide what evidence they need, establish proportionate supplier carbon requirements and determine how responses will influence procurement and ongoing supplier engagement.

Requirements can then become more sophisticated as the organisation improves its Scope 3 data and develops its wider carbon reduction strategy.

Why supplier engagement supports carbon reduction

Reducing supply chain emissions requires more than asking suppliers to complete a questionnaire.

Businesses need reliable information, clear expectations and ongoing engagement to understand where emissions occur and identify opportunities for improvement.

A structured approach to supplier carbon requirements can improve visibility while helping businesses make procurement decisions that support wider environmental objectives.

Over time, better supplier information can also strengthen Scope 3 reporting and provide a clearer picture of environmental impact across the value chain.

How Green Economy can help

Green Economy provides supplier sourcing support to help businesses establish procurement requirements, refine project briefs and connect with trusted low carbon suppliers. Its independent and impartial service also supports supplier shortlisting, quote and contract review, and informed procurement decisions.

Through sustainability consultancy, Green Economy can also provide supply chain mapping and engagement support, including analysis to measure and report Scope 3 emissions and advice and training to help organisations engage their supply chains.

Together, this support can help businesses better understand supply chain impacts, strengthen environmental requirements and make more informed decisions as part of their wider carbon reduction activity.