When it comes to energy transitions, marine vessels tend to get overlooked, even though they are some of the worst polluters of our oceans and air. The heavy duty diesel fuel used by most ships presents serious problems for the planet. This week on Sea Change Radio, we speak with Maria Gallucci, a Senior Reporter at Canary Media, who describes efforts being made to transform boats and ships into zero emission marine fleets. We look at a project to electrify tugboats in San Diego, a cutting-edge hydrogen ferry about to launch in San Francisco, and innovations to reduce greenhouse gas emissions in the international cargo shipping space.