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By Linuxman26
Kinetic Energy Supported Transportation Structures (KESTS) to Geostationary Earth Orbit (GEO)

Brief quote:
Abundant clean electric power for the whole world, before petrochemicals are all burned up; solar-powered total recycling of even the worst of civilization's toxic waste materials; efficiently high spaceports from which conventional rockets can easily reach out to the rest of the solar system; and a place to build passively shielded large scale space habitats such as those designed in the mid-1970's for use at L-5 but now with easy rail commute to ground... a ring of such space habitats, built of lunar and asteroidal materials and infilling GEO, could support 3 times the entire present-day population of our planet, with a comfortable sustainable lifestyle for all... potentially.

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