https://progressivepost.eu/wp-content/uploads/PP22_WEB_PP.pdf
https://wiiw.ac.at/the-emissions-reduction-potential-for-freight-transport-on-a-high-speed-rail-line-along-the-european-silk-road-dlp-6635.pdf
https://reutersevents.com/events/reports/docs/magazine-december-2020.pdf
https://www.ipcc.ch/report/ar6/wg2/