1. Airbus global market forecast: Mapping demand 2016/2035 (leaflet). Available at http://www.airbus.com.cn/fileadmin/media_gallery/files/brochures_publications/GMF/Global_Market_Forecast_2016-2035.pdf, accessed on 2016-10-20
2. Boeing traffic and market outlook. Available at http://www.boeing.com/commercial/market/long-term-market/traffic-and-market-outlook, accessed on 2016-10-20
3. European Commission Climate Action. 2016. Reducing emissions from aviation. Available at http://ec.europa.eu/clima/policies/transport/aviation/index_en.htm, accessed on 2016-10-26
4. Stockholm resilience centre: The nine planetary boundaries. Available at http://www.stockholmresilience.org/research/planetaryboundaries/planetary-boundaries/about-the-research/the-nine-planetary-boundaries.html, accessed on 2016-10-26
5. European Commission. The EU emissions trading system (EU ETS). Available at https://ec.europa.eu/clima/sites/clima/files/factsheet_ ets_en.pdf, accessed on 2017-03-16