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I'm starting to see the outline of a low-energy future:
Structures made from seacrete or microbial-bound sandstone
Soil from nano-particulate clay infusion
Ecosystems from AI-driven livestock grazing
Fuel, Bio-char and carbon sequestration from Cool Planet
Weather covers as tents after Frei Otto, covered with foil-based PV cells
All populated of course by cool old cars and trucks from the 1940s and 1950s with EV conversion drivetrains and solid-electrolyte battery packs.