you still have to get the cargo up there, which takes energy. maybe a little less if you don't have to make continuous attitude adjustments, but i'm thinking it would be a comparable expense in energy...
scramjets. half the fuel is the oxygen in the atmosphere, which could be replenished by replanting all the deforested rainforest and replanting a lot of defunct temperate forests. plus maybe have genetically engineered hyperactive algae farms putting out high yield of oxygen and sucking all that co2 in... like as if they were on speed. hmmm.
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you still have to get the cargo up there, which takes energy. maybe a little less if you don't have to make continuous attitude adjustments, but i'm thinking it would be a comparable expense in energy... scramjets. half the fuel is the oxygen in the atmosphere, which could be replenished by replanting all the deforested rainforest and replanting a lot of defunct temperate forests. plus maybe have genetically engineered hyperactive algae farms putting out high yield of oxygen and sucking all that co2 in... like as if they were on speed. hmmm.