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Techniques designed to maximize the yield of desired resources (water, metals, volatiles) from raw materials (ore, regolith, atmosphere) while minimizing energy input, waste, and [environmental] footprint. In space, [efficiency] is survival—every joule of energy and kilogram of mass is precious. Methods include in-situ resource utilization (ISRU) like using solar ovens to bake oxygen out of lunar soil, [electrochemical] processing of asteroid ore, or passive wind-traps to collect atmospheric moisture on Mars.
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