Claims

Blue hydrogen production from natural gas requires 40% more feedstock than would be needed if the same energy were delivered as natural gas directly, because carbon carries most of the chemical energy in methane (CH4), and when carbon is stripped off and stored, the remaining hydrogen is a much lower-energy fuel.

Hydrogen production via reforming of natural gas (gray and blue hydrogen) requires applying very hot steam to methane (CH4), causing hydrogen molecules to separate from the carbon, which is then oxidized to CO2—a process that generates 2% of the world's carbon emissions when CO2 is vented (gray hydrogen).