From The U.S. Energy Information Administration (EIA) who apparently a US government body but may not be are good source of information, as they may have vested interests
“To produce hydrogen, it must be separated from the other elements in the molecules where it occurs. Hydrogen can be produced from many different sources in different ways to use as a fuel. The two most common methods for producing hydrogen are steam-methane reforming and electrolysis (splitting water with electricity).23 June 2023”
From Wikipedia on Steam reforming or steam methane reforming
“Hydrogen produced by steam reforming is termed 'grey hydrogen' when the waste carbon dioxide is released to the atmosphere and 'blue hydrogen' when the carbon dioxide is (mostly) captured and stored geologically - see carbon capture and storage. Zero carbon 'green' hydrogen is produced by thermochemical water splitting, using solar”
From Wikipedia on Electrolysis of water
“As of 2022, commercial electrolysis requires around 53 kWh of electricity to produce one kg of hydrogen, which holds 39.4 kWh (HHV) of energy”
So it is only 74% efficient
It would appear that the only Green way of producing hydrogen is by using electricity from Solar panels, but that would only be 74% efficient. Considering the above.
Geoff Greig BMW recently announced that they've resolved the issues relating to the use of Hydrogen and will no longer develop battery electric cars.
Michael Lowe Yes BMW may have said that. But business can make more profit by creating problems than solving them.
Making, compressing ,storing and distributing Hydrogen is far more inefficient than using electricity to propel vehicles. But country to popular belief, business do not make bigger profits by being efficient.
The internal combustion engine is very inefficient yet we have been using them for over 100 years. It is mainly because of environmental concerns that alternatives are now being looked at. Hydrogen can solve the environment problem but will not solve the inefficiency problem. It creates the problem of making, compressing ,storing and distributing it. That is good for making more profits. Which in turn is good for the world economy.
That is why BMW have said they have resolved the issues related to the use of hydrogen.