- Eurocontrol. (2023). The challenge of long-haul flight decarbonisation: When can cutting-edge energies and technologies make a difference? (Think Paper #21). Eurocontrol.
- Norris, G. (2023). Dreaming big. Aviation Week & Space Technology, March 13-26, 2023, 14-16.
- One Planet Network. (2021). The Glasgow declaration: A commitment to a decade of tourism climate action. O. P. Network.
- Peeters, P., & Papp, B. (2023). Envisioning Tourism in 2030 and Beyond. The changing shape of tourism in a decarbonising world. T. Foundation.
- Schäppi, R., Rutz, D., Dähler, F., Muroyama, A., Haueter, P., Lilliestam, J., Patt, A., Furler, P., & Steinfeld, A. (2022, 2022/01/01). Drop-in fuels from sunlight and air. Nature, 601(7891), 63-68. https://doi.org/10.1038/s41586-021-04174-y
- World Travel & Tourism Council (WTTC). (2023). WTTC reveals Germany’s Travel & Tourism sector’s climate footprint. WTTC https://wttc.org/news-article/wttc-reveals-germanys-travel-and-tourism-sectors-climate-footprint (“The Travel & Tourism sector has decoupled its economic growth from its greenhouse gas emissions”)
