Verifying ESG Claims With Public Web Evidence

New EU rules on green claims apply from 27 September 2026. A practical method for checking sustainability claims against public evidence, and tracking changes.

Sustainability claims are easy to make and hard to check. “Eco-friendly packaging.” “Climate neutral delivery.” “Certified sustainable sourcing.” Each one appears on a product page, in an ad or in an annual report, and each one either stands on evidence or does not. For ESG analysts, sustainability teams and anyone assessing a company’s environmental story, the question is how to tell the difference from the outside, using what is publicly visible.

The question is also getting sharper. In the EU, rules that ban a whole category of vague green claims apply from 27 September 2026. This guide covers what changed, a practical method for building an evidence file on a company’s claims from public web sources, and the limits of what outside evidence can prove.

Key takeaways

From 27 September 2026, EU consumer law bans generic environmental claims that a trader cannot back with recognised excellent performance, sustainability labels not based on a certification scheme or set up by public authorities, and product “neutrality” claims based on carbon offsetting.
The separate EU Green Claims Directive is stalled, not in force. The Commission announced its intention to withdraw it in June 2025, and it remains blocked.
In the United Kingdom, the Competition and Markets Authority can now fine companies up to 10% of global turnover for breaches of consumer law, including misleading green claims.
Public evidence is best at finding inconsistency: a claim that does not match the company’s own reports, a certificate the issuer does not list, wording that quietly changed.
Outside evidence can show that a claim is unsupported or contradicted. Whether a claim is unlawful is a question for counsel.

What changed on 27 September 2026

Directive (EU) 2024/825, known as the directive on empowering consumers for the green transition, amends EU consumer law. Member States had to transpose it by 27 March 2026 and apply it from 27 September 2026. It adds several practices to the list that are banned in all circumstances, including:

Generic environmental claims that the trader cannot back with recognised excellent environmental performance relevant to the claim. The directive’s own examples include “environmentally friendly”, “eco-friendly”, “green”, “ecological”, “climate friendly”, “energy efficient” and “biodegradable”.
Sustainability labels that are not based on a certification scheme and not established by public authorities.
Claims about a whole product or business when the claim concerns only one aspect of it.
Offset-based neutrality claims: claiming a product has a neutral, reduced or positive greenhouse gas impact based on the offsetting of emissions. The directive’s examples include “climate neutral”, “CO2 neutral certified”, “carbon positive”, “climate net zero”, “climate compensated”, “reduced climate impact” and “limited CO2 footprint”.

It also tightens claims about future environmental performance, such as net-zero targets, which now need a detailed and realistic implementation plan, verified by an independent expert.

Two other developments shape the landscape. The Green Claims Directive, which would have set detailed substantiation rules, is stalled: the Commission announced on 20 June 2025 that it intended to withdraw it, the 2026 work programme still lists it as pending, and the European Parliament records it as blocked. And CSRD sustainability reporting was narrowed in 2026 to undertakings with more than EUR 450 million in net turnover and more than 1,000 employees, so fewer companies will publish the detailed reports that analysts use as a baseline.

In the United Kingdom, the CMA’s direct consumer enforcement powers have been in force since April 2025, with fines of up to 10% of global turnover, and in January 2026 it published guidance on making green claims across the supply chain.

The rules differ by jurisdiction and are still moving. Treat this as orientation, and take specific questions to counsel.

The method: build a claims register

The core of the work is a structured register of what a company claims, where, and what evidence stands behind each claim.

1. Collect the claims, everywhere they appear

Claims live in many places, and they do not always agree:

Product pages and packaging images on the company’s own site and on major retailers.
Sustainability and “our impact” pages.
Advertising, including ads that run only in certain markets.
Annual and sustainability reports, investor presentations and press releases.
Local-market sites. A company may make a claim on its French site that it no longer makes on its German one, or the reverse.

That last point matters more from 27 September 2026, because companies are revising EU-facing claims now. Collect each market’s version of the site as a visitor in that market would see it, and record where each capture came from. A residential exit in the target country, such as customer-USERNAME-country-fr on Shifter’s gateway, loads the page the way a French consumer receives it. The same logic applies to ads, which are often targeted by country, as described in catching cloaked and geo-targeted ads.

2. Classify each claim

Give every claim a type, because the type decides what evidence would support it.

Claim type	Example	What would support it	Where to look
Generic	”eco-friendly”, “green”	Recognised excellent performance relevant to the claim	Certification registries, official ecolabel databases
Label or certificate	A logo or “certified”	A valid certificate from a recognised scheme	The scheme’s public certificate directory
Specific and measurable	”50% recycled plastic”	Data the company publishes or a third party verified	Sustainability report, product declarations
Offset-based neutrality	”climate neutral delivery”	Under the new EU rules, offsets cannot support it	Offset disclosures, often in footnotes
Future commitment	”net zero by 2040”	A detailed implementation plan with independent verification	Transition plan, verifier statements

A first pass can be automated. A small scanner flags wording that will need evidence, using the examples the directive itself gives:

import re

# Based on the examples in the recitals of Directive (EU) 2024/825, plus close variants.
GENERIC = ["environmentally friendly", "eco-friendly", "green", "nature's friend", "ecological",
           "environmentally correct", "climate friendly", "gentle on the environment",
           "carbon friendly", "energy efficient", "biodegradable"]
OFFSET_BASED = ["climate neutral", "co2 neutral", "carbon neutral", "carbon positive",
                "climate net zero", "climate compensated", "reduced climate impact",
                "limited co2 footprint"]


def flag_claims(text, window=80):
    """Return claim phrases that need evidence, with surrounding context for a reviewer."""
    low = text.lower().replace("co₂", "co2")
    hits = []
    for kind, terms in (("generic", GENERIC), ("offset-based", OFFSET_BASED)):
        for term in terms:
            for m in re.finditer(r"\b" + re.escape(term) + r"\b", low):
                start, end = max(0, m.start() - window), m.end() + window
                hits.append({"type": kind, "term": term, "context": text[start:end].strip()})
    return hits

It is a triage tool, not a verdict. “Green” appears in company names and product colours; the context window is there so a reviewer can dismiss those in seconds.

3. Check each claim against independent evidence

The strongest public checks compare what the company says with what someone else says about it.

Certificates: most certification schemes publish directories of valid certificate holders. Search for the company and the specific product or site. A logo with no matching certificate, or a certificate that expired, is a finding.
The company’s own reports: a product page claiming a figure that the sustainability report does not support, or contradicts, is a finding.
Regulatory and registry data: permits, environmental enforcement notices and incident registers published by environmental regulators.
Credible reporting: investigations by journalists or NGOs, treated as leads to verify rather than as proof.

4. Track changes over time

Claims change, often quietly. A “carbon neutral” badge that disappears in September 2026 tells you something; so does a sustainability page that is rewritten the week after a critical news story. Snapshot each claim page on a schedule and compare, recording what changed and when. The same change-detection approach used for monitoring suppliers’ public footprint works here, pointed at claims instead of addresses.

5. Preserve the evidence properly

If a finding may end up in a report, an engagement with the company or a complaint, keep it in a form that can be trusted later: the URL, a full-page capture, the HTML source, the time in UTC, the market it was loaded from, and a cryptographic hash of each file. The preservation method is set out in detail in building court-ready evidence from online listings; it applies to green claims as well as counterfeits.

Red flags worth prioritising

Some patterns deserve attention first:

Neutrality or “net zero” product claims that mention offsets anywhere in the fine print.
Environmental logos that do not correspond to any scheme you can find, or that the company appears to have created itself.
Claims about the whole product (“sustainable jacket”) based on one component (“recycled zip”).
Future targets with no published plan, or a plan with no independent verification.
Claims that differ between markets, especially weaker wording on EU sites than elsewhere.
Recent quiet removals of claims, which may signal a company that knows the claim would not hold.

What public evidence can and cannot prove

Public web evidence is excellent at showing that a claim is unsupported, inconsistent with the company’s own disclosures, or contradicted by an independent source. It cannot show what the company knows privately, and the absence of public evidence is not proof that evidence does not exist. Present findings as questions the company needs to answer, with the evidence attached, rather than as conclusions. Whether a particular claim breaches a particular law is a legal judgement that depends on the jurisdiction, the audience and the full context, and belongs with counsel.

The bottom line

From 27 September 2026, a significant set of vague green claims is simply banned in EU consumer marketing, and regulators elsewhere have sharper tools than they did two years ago. That makes outside verification of ESG claims both more valuable and more tractable: the categories are clearer, and the evidence is increasingly public.

The method is straightforward. Collect every claim from every market, classify it, check it against independent public sources, track how it changes, and preserve what you find. Done consistently, it turns “we are committed to sustainability” into a register of specific statements, each one either supported or not.

Sources and references

Directive (EU) 2024/825 amending Directives 2005/29/EC and 2011/83/EU as regards empowering consumers for the green transition. Transposition by 27 March 2026, application from 27 September 2026.
European Parliament, Legislative Train: Substantiating green claims. Status of the Green Claims Directive proposal.
Directive (EU) 2026/470 amending the Corporate Sustainability Reporting and Due Diligence Directives. Revised CSRD scope.
UK Government, CMA to boost consumer and business confidence as new consumer protection regime comes into force, 7 April 2025.
Competition and Markets Authority, Making green claims: getting it right across the supply chain, 22 January 2026.
Shifter, Residential Proxies geo-targeting documentation.

This article is general information, not legal advice. Consult counsel about specific claims and jurisdictions.