Fuel processor or reformers split the hydrogen and carbon relatively more easily and then use the hydrogen.
Easy to split hydrogen and oxygen molecules apart using electricity(the biggest tech hurtle). Is the core of the REAL hydrogen economy. Energy can be stored.
Demand for fossil fuels. Most people don’t live near the extraction sites. Fossil Fuel emissions severely degrade air quality, and the carbon worsens the greenhouse effect, affecting the world’s climates. Third world economies are especially susceptible to fuel economies.