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I saw this paper http://energywatchgroup.org/wp-content/uploads/EWG_LUT_100RE... on HN recently which claims that it shouldn't be too expensive to convert to 100% renewable energy by 2050 (but you have to actually start on it of course). Liquid fuel would still be used for ships, jets, rockets, and some trucks and to be net zero carbon that fuel needs to be produced either by plants (biofuel) or by Prometheus-style direct capture. In this case the fuel is not a source of energy but a denser storage medium for renewable electricity.

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