We Are Sailing?

Marine transport currently accounts for circa 3% of global 'greenhouse gas' emissions. Most large ships, currently use heavy diesel oils for their engines. It's been suggested that marine 'greenhouse gas' emissions could be halved, by 2030, without damaging trade (https://www.theguardian.com/environment/2023/jun/26/shipping-emissions-could-be-halved-without-damaging-trade-research-finds). The International Marine Organization suggest a levy of $100 per tonne for marine transport carbon emissions. It's suggested this will incentivise fleet owners to fully explore alternatives, in order to reduce their costs.