From Claim to Proof: A Systematic Review of Greenwashing, Certification and the Regulatory Substantiation Turn in Tourism and Hospitality, 2024–2026. HARMONI: Journal of Sustainable & Responsible Tourism, [S. l.], v. 1, n. 02, p. 166–179, 2026. Disponível em: https://harmonijournal.com/index.php/harmoni/article/view/11. Acesso em: 18 oct. 2026.