the Earth. In addition, if the structure of the SPS is augmented with thrusters, de-spun docking platforms, etc., the difference between terrestrial and lunar specific masses is likely to decrease. Such structural additions may also tip the balance toward inflatable sphere designs. FIGURE 6. Projected world energy shortfall determined by subtracting allowable fossil fuel energy production (based on a 1% annual decrease in fossil fuel energy production) from the projected annual fossil fuel energy demand. The allowable production was determined by the need to prevent a global greenhouse warming. Adapted from Reference 27.
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