3 ms·

It's simply because it makes a poor energy carrier. You can also make methane from Water + Air + Solar Energy, and methane is a lot easier to deal with.

• ncmncm 5y ago
  That needs a source of carbon.
  • ars 5y ago
    That's what the air is for, you pull the CO2 right out of the air and use it for carbon.
    • ncmncm 5y ago
      CO2 is under 0.5%. Concentrating it is energetically expensive, although as energy cost continues down, cracking it may yet prove cheaper than mining and transporting CH4. Still, having concentrated CO2, it would be much better to fix it in a form from which it would not immediately be emitted back to the atmosphere, such as graphene, graphite fiber, nanotubes, or a polyester or polypropylene. Most uses also need hydrogen. There will be a great deal of waste oxygen. That might best be dissolved into river water.
      • ncmncm 5y ago
        ... under 0.05%, that is.