Carbon footprint is becoming a widely used measure of an organization's contribution to climate change. However, despite a growing number of international standards and guidelines, there is still no consistent and widely agreed-upon methodology for assessment. The current practice of carbon footprint reporting in many industries is not well known and very ambiguous. This paper reports on a study of 150 of the largest hotel groups in the world to see how they assess and report their carbon footprints. The paper concludes that carbon footprint reporting IN THE HOTEL industry is scarce, and even for large companies calculations are unclear, not assured and not comparable.