Dr. Stefan Gossling is a professor at the Department of Service Management, Lund University, and research coordinator at the Centre of Sustainable Tourism at the Western Norway Research Institute. He is specialising in tourism and transport sustainability, and has recently contributed to the IPCC's fourth Assessment Report as well as UNWTO-UNEP-WMO report Climate Change and Tourism: Responding to Global Challenges. Dr. Paul Upham is a Research Fellow in the Tyndall Centre for Climate Change Research at the University of Manchester, UK. He is an environmental social scientist specialising in public and stakeholder opinion of low carbon energy options and scenarios and has a research background in aviation climate and sustainability policy.