The carbon in the fuel comes from CO2 which is captured out of sea water. The problem with fossil fuels is that they transfer old carbon which used to be store

The carbon in the fuel comes from CO2 which is captured out of sea water. The problem with fossil fuels is that they transfer old carbon which used to be stored underground into the atmosphere. This process only uses carbon that is already part of the active carbon cycle, so it is carbon neutral as long as the electricity source is.