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Sadly I don't think we are there yet. Some electrical generation is cheaper with renewables. But that only helps with electricity. What about aviation, or const

• ben_w 4y ago
  Well, aviation, sure, we'd either have to make new hydrogen fuelled jet engines, or industrialise Sabatier process and methane fuelled jets, or industrialise Sabatier process and polymerisation of methane into longer chains for direct substitution with existing jet fuel, so that's certainly a thing to doubt. But construction? Nah, we use concrete because it's cheap, but PV electricity is so much cheaper than other sources it's got a obvious path for widespread use of structural aluminium (and I've seen a demo of electrolytic iron reduction, so also for structural steel), and filling in the gaps between the structural frame has so many existing options it isn't worth listing them all even if I knew them and their various situational pros/cons.