Maersk plans to run a small container ship on e-methanol as early as 2023. 10,000 tonnes of carbon neutral methanol will be produced using solar powered electrolysis (to get the Hydrogen molecules) plus biogenic CO2 - extracted from biomass by rotting, combustion or other processing. Biogenic CO2 is considered "carbon neutral" if when accounting for the living plant absorbing CO2 whilst alive and releasing it when dead, there has been no net
increase in greenhouse gas (GHG) emissions on a life-cycle basis.
https://www.maersk.com/news/articles/2021/08/18/maersk-secures-green-e-methanol