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Solar power+CO2 into liquid fuel sounds good. I'm just noting that reducing CO2->C+O2 takes the same energy as you get from combusting C+O2->CO2. So if you're talking about reducing the atmospheric CO2 that all engines and power plants have made for the last 100 years...
That's if you want to reverse all added CO2, which we wouldn't have to do for a while, if that's a meaningful goal. But the ability to make all gasoline, jet fuel, etc carbon neutral in the future is pretty big.
The ability to make fuel from atmospheric CO2 is not new, the big questions are efficiency and cost. The Prometheus process is ~50-60% efficient, electricity to chemical. Then you burn it in your ~25-35% efficient car engine and get 10~20%, electricity to mechanical.
So we're already an order of magnitude worse than using electricity to charge batteries to power motors, and we haven't paid for the CO2 capture or the factory yet.
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