He has advised and led projects for a wide range of government agencies and tourism organizations around the world, including the United Nations World Tourism Organization, United Nations Environment Programme, World Bank, European Tourism Commission, World Travel and Tourism Council, International Olympic Committee, OECD, the Caribbean Tourism Organization. He has also been a contributor to the UN Intergovernmental Panel on Climate Change Third, Fourth, Fifth, and Sixth Assessments and their 1.5°C special report. In 2021, he was ranked in the world top 250 climate scientists by Reuters. His tourism research publications have been downloaded over a half million times and have been featured in many leading media outlets, including The Economist, New York Times, Washington Post, Wall Street Journal, BBC, Time, Scientific American, and National Geographic.