How to Communicate Sustainability Efforts Without Greenwashing

Last updated: May 21, 2026.

Communicating sustainability well is not about sounding greener than the company is. It is about helping customers, employees, investors, lenders, suppliers, and regulators understand what the company is doing, what evidence supports it, and what still needs work.

This has become more important because sustainability claims are under heavier scrutiny. Broad claims such as "eco-friendly," "sustainable," "green," or "carbon neutral" can create risk if the company cannot define the boundary, show the evidence, and explain the limits of the claim. In many cases, the safer and stronger message is more specific: what changed, where it changed, what data supports it, and what the company will do next.

This guide explains how to communicate sustainability efforts in a practical, evidence-led way. If you need help turning sustainability work into reports, website copy, customer responses, or board-ready materials, Keslio can support reporting and communications, sustainability strategy, and GHG emissions calculations.

Short answer: Effective sustainability communication is specific, evidence-backed, proportionate, and consistent. Companies should avoid broad environmental claims unless they can be clearly substantiated. A good communications process starts with real sustainability work, translates it into claim-ready evidence, checks the audience and channel, and keeps a record of what has been said publicly.

Why sustainability communication is harder now

Stakeholders want more sustainability information, but they are also more skeptical. Customers want to know whether a product or service has a lower impact. Employees want to know whether the company is serious. Investors and lenders want decision-useful data. Procurement teams ask suppliers for emissions, policies, targets, and evidence. Regulators and consumer protection authorities increasingly look at whether environmental claims are misleading.

The result is a narrow lane: say too much without evidence and the company risks greenwashing; say nothing and stakeholders may assume the company has no plan. The answer is not louder messaging. It is better discipline.

That discipline applies across channels: sustainability reports, ESG pages, product pages, sales decks, LinkedIn posts, RFP responses, supplier questionnaires, press releases, recruitment materials, and internal presentations.

Start with the audience and decision

Before drafting any sustainability message, ask who needs the information and what decision they are trying to make.

• Customers may want to know whether your product, service, or supplier response meets their requirements.
• Procurement teams may need emissions data, policies, certifications, supplier controls, or a clear methodology note.
• Investors and lenders may want comparable metrics, governance, risks, targets, and progress over time.
• Employees may want to understand what the company is changing internally and where they fit into the plan.
• Regulators may expect specific disclosures, boundaries, definitions, and records.

Once the audience is clear, the content can be more focused. A sustainability report, a customer questionnaire, and a social post should not carry the same level of detail, but they should all be consistent with the same underlying evidence.

Make claims specific enough to check

The most common problem in sustainability communication is vague language. Claims like "green," "clean," "eco-friendly," "planet positive," or "sustainable" can be hard to defend unless they are clearly qualified.

A stronger claim usually answers five questions:

• What exactly is the claim about? The whole company, one product, one service, one facility, one material, one contract, or one reporting year?
• Compared with what? A prior year, a baseline, an industry average, a previous material, or no comparison at all?
• What evidence supports it? Activity data, emissions calculations, supplier evidence, certificates, invoices, meter data, audit records, or methodology notes?
• What is excluded? Subsidiaries, geographies, Scope 3 categories, subcontractors, use phase, disposal, offsets, or estimated data?
• Who approved it? Sustainability, legal, finance, operations, marketing, product, or leadership?

For example, "we reduced electricity-related Scope 2 emissions by 18 percent in our Singapore office portfolio in 2025 compared with 2024, based on market-based accounting and renewable electricity certificates" is easier to review than "we are becoming greener."

Build a claim register

A claim register is a simple internal record of sustainability claims the company uses publicly or with customers. It does not need to be complex, but it should prevent teams from inventing claims from scratch each time.

A useful register includes:

• The claim text.
• The channel where it is used.
• The owner.
• The supporting evidence.
• The reporting period or data period.
• The boundary and exclusions.
• The review date.
• The approval status.
• The next refresh date.

This is especially useful when marketing, sales, sustainability, and leadership teams all communicate externally. It also helps keep website copy, reports, customer responses, and sales materials aligned.

Connect communications to material topics

Sustainability communication should not be a collection of disconnected good-news stories. It should reflect the topics that are material to the company and its stakeholders.

A materiality assessment can help identify the topics that deserve more structured communication: emissions, energy, waste, water, health and safety, labor practices, human rights, responsible sourcing, data privacy, product safety, biodiversity, or other issues. Once those topics are clear, communication becomes easier because the company knows what to prioritize.

Keslio's article on materiality assessment explains how companies can identify and organize these topics. For reporting structure, see also Keslio's guide to the GRI Standards.

Use data without hiding uncertainty

Sustainability data is rarely perfect, especially in the first reporting cycle. Companies may have estimated emissions, partial supplier responses, missing invoices, inconsistent HR data, or gaps between sites. The communication should not pretend those gaps do not exist.

Good communication explains the method and the limitation. For example:

• The reporting period used.
• The sites, entities, or operations included.
• Whether emissions are Scope 1, Scope 2, or Scope 3.
• Whether data is measured, estimated, supplier-provided, or spend-based.
• Whether the company changed methodology from the previous year.
• Which data gaps remain and how the company plans to improve them.

This does not weaken the message. It usually makes the message more credible. For companies building better data systems, see Keslio's guide to managing ESG data.

Be careful with carbon neutral and net zero claims

Claims about carbon neutrality, net zero, climate positivity, or offsetting can be especially sensitive. These claims often depend on emissions boundaries, reduction progress, offset quality, target timelines, and whether the claim relates to a product, service, organization, or event.

Before using these claims, companies should check whether they can explain:

• The full emissions boundary covered by the claim.
• The baseline and reporting period.
• The reduction achieved before offsets are used.
• The type, source, and quality of any credits or removals.
• Whether the claim is current, future-looking, or target-based.
• Whether the claim could mislead customers about the company's overall impact.

If the emissions baseline is not strong yet, it is often better to communicate the work being done to calculate emissions and reduce them, rather than making a headline climate claim too early.

Understand the greenwashing context

Different jurisdictions treat environmental claims differently, but the direction of travel is clear: claims should be truthful, specific, substantiated, and not misleading.

In the United States, the Federal Trade Commission's Green Guides remain an important reference for environmental marketing claims. In the United Kingdom, the Competition and Markets Authority's Green Claims Code sets out principles for making environmental claims. In the European Union, Directive (EU) 2024/825 on empowering consumers for the green transition strengthens rules against misleading environmental claims and generic green claims; separate EU green-claims proposals have changed over time, so companies should check the current legal status before relying on them.

For a deeper overview, see Keslio's article on greenwashing regulations you need to know. This article is general guidance and not legal advice.

Align internal teams before publishing

Most sustainability communication problems start internally. Marketing wants a stronger headline. Sales wants a customer-ready answer. Sustainability knows the data is still incomplete. Finance owns some of the numbers. Operations knows the site-level reality. Legal worries about overclaiming.

A simple approval workflow helps:

• Marketing drafts the message in plain language.
• Sustainability checks the technical accuracy and evidence.
• Finance or operations confirms the data source where relevant.
• Legal or compliance reviews higher-risk claims.
• Leadership approves major public claims, reports, and targets.

This workflow should be proportionate. A LinkedIn post does not need the same review as an annual report, but both should be consistent with the evidence base.

What to communicate at each maturity stage

Companies do not need to wait until every sustainability system is perfect. They should match the message to the maturity of the work.

• Early stage: communicate the topics being assessed, the baseline being built, the governance being assigned, and the first actions underway.
• Baseline stage: communicate measured data, boundaries, material topics, initial targets, and near-term actions.
• Implementation stage: communicate progress against targets, operational changes, supplier engagement, emissions reductions, and lessons learned.
• Advanced stage: communicate multi-year performance, third-party standards used, external assurance where applicable, mature data controls, and clear future plans.

This avoids the trap of sounding more mature than the company is. It also makes progress visible.

Common mistakes

• Using broad claims without qualification: words like sustainable or eco-friendly need boundaries and evidence.
• Publishing targets without plans: stakeholders need to understand how the target will be pursued.
• Ignoring negative impacts: credible communication includes trade-offs, gaps, and areas for improvement.
• Letting each team write separately: inconsistent messages create confusion and risk.
• Overusing stock language: generic sustainability copy is less persuasive than specific operational evidence.
• Hiding methodology: data without boundaries, assumptions, or source notes is hard to trust.
• Forgetting customer requests: sustainability communication is not only public-facing; it also lives in RFPs, supplier portals, and account-team responses.

How Keslio can help

Keslio helps companies turn sustainability work into clear, credible, and useful communication. This can include:

• Reviewing sustainability claims for clarity, evidence, and consistency.
• Building a claim register and supporting evidence pack.
• Preparing sustainability report sections and ESG website copy.
• Creating customer-ready responses for supplier questionnaires and RFPs.
• Structuring emissions, ESG data, and methodology notes for public communication.
• Aligning sustainability messaging with strategy, material topics, and reporting frameworks.
• Helping teams explain progress without overstating maturity.

If you need help communicating sustainability work without drifting into vague or risky claims, Keslio's reporting and communications service can help turn the evidence into clear, practical messaging.