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sadly this is all I started thinking, but only because of how much he pushes EVs and Solar. It seems like a complete opposite move but given current technology there isn't a clean method to do what he wants.

I would be really curious how much works has gone into neutral fuels. pretty sure lox and such can be made neutrally with solar powered chillers but what is his other fuel? a hydrogen type would be similar would it not?

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He mentions the possibility of making the fuel from solar power, water and CO2 on Earth in the same way he plans to for Mars. It wouldn't make economic sense now though. If you care about the environment that much, use the same process to make the same methane and run your ICE car off it. That's old tech.

Methane + oxygen (methalox).

That produces C02, and given the energies required, would produce a lot. A retrograde step.

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