Articles | Postado no dia: 13 October, 2026
Greenwashing Requires Evidence: Why Environmental Claims Must Be Supported
Environmental concerns have increasingly influenced investments, financing, procurement decisions and business relationships. In this context, communicating corporate sustainability commitments has become a strategic decision for companies. The problem arises when corporate messaging is not supported by evidence capable of substantiating the claims being made.
This is where greenwashing comes into play. The term refers to presenting products, services, practices or initiatives as environmentally responsible without sufficient grounds to support that perception. The issue is not limited to deliberately false information. Vague, exaggerated, incomplete or unsupported claims may also lead consumers and other market participants to reach misleading conclusions.
Terms such as “sustainable,” “eco-friendly,” “carbon neutral” or “environmentally responsible,” for example, require verifiable support capable of demonstrating what is actually being claimed, which methodologies were used and what limitations apply to the statement.
This concern is also supported by Brazilian consumer protection legislation. Brazil’s Consumer Protection Code requires suppliers to retain the factual, technical and scientific information supporting advertising claims, prohibits misleading advertising and places the burden of demonstrating the truthfulness and accuracy of the communication on the party sponsoring it.
As important as the consistency of the information disclosed is the company’s ability to demonstrate, at a later stage, the grounds that supported its use. Environmental claims should be accompanied by clear criteria, verifiable data and documentation capable of reconstructing the process that led to the communication. Evidence, therefore, should not become a concern only after a challenge arises. It should be part of the company’s sustainability and communications strategy from the outset.
The consequences of unsupported environmental communication can extend beyond reputational damage. Depending on the circumstances, environmental claims lacking technical support may trigger challenges from consumer protection authorities, public prosecutors, civil society organizations, competitors, investors and business partners. They may also lead to litigation, corrective measures involving advertising campaigns and disputes concerning liability arising from inaccurate or potentially misleading information.
It is precisely because of this potential scrutiny that organizing evidence in advance becomes increasingly important. Technical studies, calculation methodologies, certifications, reports, databases, internal records and criteria used to approve campaigns may play an important evidentiary role in administrative or judicial proceedings. More than simply possessing this information, companies need to be able to identify its origin, demonstrate the methodology applied and objectively connect it to the environmental claim that was communicated.
The risks become even more significant when environmental commitments are incorporated into contracts, financing transactions, due diligence processes and relationships with investors. In these circumstances, a gap between corporate messaging and operational reality can create reputational, economic and legal consequences, particularly when such claims are material to the establishment of business relationships or investment decisions.
For this reason, preventing greenwashing should not be limited to reviewing advertising content. It requires internal processes capable of ensuring that environmental claims are technically supportable, legally appropriate and properly documented. Coordinated action among technical, sustainability, communications and legal teams can reduce inconsistencies and allow potential challenges to be addressed with greater certainty and planning.
Before publishing any environmental claim, companies should assess not only its technical consistency but also its legal soundness. In a market increasingly attentive to ESG criteria, the relevant question is not whether a company has a sustainability narrative, but whether it has sufficient evidence, controls and governance to support it.
After all, environmental credibility is not built through messaging alone, but through the ability to prove what is being claimed.
Authors: Clara Cidrack, Izadora Barbosa, Matheus Celestino and Thaís Medeiros
