Can Fuel Cells Power Ships ???

According to this report, electric powered ships are the next big thing:

https://deutsche-wirtschafts-nachrichten.de/2018/11/03/elektro-mobilitaet-haelt-einzug-die-schifffahrt/ [translation required]

But notice the report does not discuss the source of energy for the fuel cells which would power such ships.

Here is what they left out - fuel cells are powered by hydrogen and oxygen. And where does the hydrogen come from?

Hydrogen is also found in many organic compounds, notably the hydrocarbons that make up many of our fuels, such as gasoline, natural gas, methanol, and propane. Hydrogen can be separated from hydrocarbons through the application of heat - a process known as reforming. Currently, most hydrogen is made this way from natural gas. An electrical current can also be used to separate water into its components of oxygen and hydrogen. This process is known as electrolysis. Some algae and bacteria, using sunlight as their energy source, even give off hydrogen under certain conditions.

Source - https://www.renewableenergyworld.com/hydrogen/tech.html

Before we get all giddy about electric ships, someone needs to do the math and show how the entire cycle of hydrogen production and utilization is less polluting than the methods currently in use. Until that is done, I would be highly suspicious of all these "too cheap to meter" claims.