“From Claim to Proof: A Systematic Review of Greenwashing, Certification and the Regulatory Substantiation Turn in Tourism and Hospitality, 2024–2026” (2026) HARMONI: Journal of Sustainable & Responsible Tourism, 1(02), pp. 166–179. Available at: https://harmonijournal.com/index.php/harmoni/article/view/11 (Accessed: 18 October 2026).