Lee Green - Practical steps to bridge the sustainability evidence gap
As regulators clamp down on exaggerated environmental claims, marketing and communications teams require practical methods to verify their messaging before publication. The responsibility no longer rests solely with consumer-facing brands; it extends throughout the global supply chain.
In his work with Cascale and through the development of My Green Comms, Lee Green highlights an essential operational shift: brands are now legally accountable for the environmental claims they inherit from their suppliers and manufacturers.
Supply chain claim accountability means that, for example, a consumer brand which repeats a claim of its supplier in an ad must provide verifiable data and certification.
Early lessons from the My Green Claims benchmark
To understand the prevalence of unsubstantiated claims, Lee initiated a global benchmark analysing live marketing copy across sectors including travel, automotive, mining, and fashion using a structured verification methodology. His results were quite alarming and show the extent of the challenge businesses are facing:
- 83 live claims evaluated: Drawn from company homepages, promotional materials, and ESG reports.
- 25 categorised as "do not publish": Over 30% of live claims failed basic credibility checks and posed immediate regulatory risk.
- 11 fully approved: Only a small minority of claims possessed adequate supporting evidence in their published form.
- SME vs multinational performance: Less than a 2% difference in average scores between small businesses and global corporations, demonstrating that claim drift affects organisations of all sizes.
Four practical verification steps for marketing teams
To protect against regulatory action and maintain credibility, Lee recommends that organisations adopt straightforward internal review habits:
- Conduct the non-comms staff test: Share proposed copy with colleagues outside marketing or legal, such as a receptionist or finance manager. Ask what they take away from the statement. Public enforcement is based on reader interpretation, not internal intent.
- Apply the 24-hour evidence rule: If supporting documentation or verification data cannot be produced within 24 hours (or within one click on digital channels), the claim is too broad to publish.
- Embed data leads in copywriting: Involve sustainability leads and data managers directly in the copy creation process rather than treating them as late-stage proofreaders.
- Avoid absolute language: Take caution with absolute terms like "100% recyclable" or "zero impact." A garment made from recycled polyester may still feature conventional zips, labels, or trims that invalidate absolute statements.










