http://www.iata.org/publications/economic-briefings/value-of-air-cargo-2016-summary.pdf
https://www.rbccm.com/assets/rbccm/docs/insights/sustainability-matters-2023.pdf
https://www.nature.com/articles/s41598-021-00053-8.pdf
When studying international trade, there were occasional moments when I moved away from mathematical ...