Global shipping produces roughly one billion tons of carbon dioxide each year — around three percent of total emissions. Right now, the industry is testing quantum algorithms to optimise vessel routes in real time, reducing fuel burn by up to fifteen percent. But beyond routing, a handful of startups are using quantum chemistry simulations to design cleaner marine fuels from ammonia and hydrogen, cutting the trial-and-error time from years to weeks. In this episode, Lucas and Luna break down how Maersk's early quantum pilot cut fuel costs on one Asia-Europe route by twelve percent, and why the International Maritime Organization's 2030 carbon-reduction targets create a narrow window for quantum to prove itself. They also explore the surprising bottleneck: not the qubits, but the lack of standardised emissions data across ports. If you've ever wondered whether quantum computing can tackle a problem as gritty as cargo ships, this episode gives you the concrete numbers and the open questions.