Update/correction: The source I'd relied on for the 80k ships figure actually reported 47k ships, as of 2014. The latest estimate, from the same source, is 10

Update/correction: The source I'd relied on for the 80k ships figure actually reported 47k ships, as of 2014. The latest estimate, from the same source, is 105k ships of 100 deadweight tonnes or greater. UN Trade & Development (UNCTAD) Review of Maritime Transport, 2014 and 2023. See: <https://news.ycombinator.com/item?id=41472992 https://news.ycombinator.com/item?id=41472992>. (And thanks to dkga for asking me to cite sources and review my previous research.)