Europe's anti-greenwashing rules took effect Sunday, and they apply to any company selling to EU consumers — including travel sellers headquartered outside the bloc.

The legislation, the Empowering Consumers for the Green Transition Directive (EmpCo), bans vague and generic environmental terms such as "eco-friendly," "green," and "climate friendly." It outlaws carbon-neutral claims based on offsetting, requires companies making claims about future climate goals to publish plans for meeting them, and imposes stricter rules on sustainability labels. Labels must now rest on a certification verified by a third party or established by a public authority. The directive also covers comparison tools and eco-labels displayed on hotels.

The enforcement has direct distribution consequences. Booking sites, hotel chains, and airlines that have leaned on sustainability badges and green messaging in their merchandising now face legal exposure if those claims lack verified certification. Booking.com already shut its Travel Sustainable program in 2024 after the Dutch consumer regulator called it possibly misleading — an early signal of how regulators intend to treat self-declared green labels.

Sustainability chiefs across the travel industry welcomed the law, saying it brings greater transparency and consistency. But they expect a shakeout: existing eco-label programs measure different things, and many will not clear the higher bar.

The European Commission cites the Nordic Swan, Blue Angel, the Austrian Ecolabel, and the Dutch Ecolabel as compliant. Green Key, one of the most widely used hotel certification programs, has switched to an audit-based accreditation process and has asked certified hotels to review their claims.

Hilton says its LightStay data platform keeps the company comfortable under the new rules, though internal data alone cannot support a marketing claim at an individual hotel property. That distinction matters for chains marketing sustainability at property level: proprietary measurement systems, however robust, do not substitute for third-party verification when the claim faces EU consumers.

Airlines face a related problem with the term sustainable aviation fuel. Executives at Abra Group, parent of carriers including Avianca and Gol, say airlines will describe lifecycle emissions reductions and production pathways instead of broad sustainability claims. The shift forces carriers to replace shorthand marketing language with more technical, verifiable descriptions of what their fuel programs actually deliver.

For sellers of travel, the practical impact lands on the booking interface. Hotel eco-labels that survive the cull become scarcer and more meaningful; those that disappear take their merchandising value with them. Distribution platforms will need to audit which certifications they display and on what basis.

The open question, as sustainability chiefs themselves frame it, is which labels survive — and how quickly platforms and chains rework their marketing claims to comply.