https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:52023DC0062&from=EN
https://www.brookings.edu/wp-content/uploads/2022/12/WP82-Hansel-et-al_12.14.pdf
https://www.bruegel.org/analysis/struggle-cut-emissions-international-aviation-and-shipping
https://www.tandfonline.com/doi/full/10.1080/14693062.2024.2341080