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If all of the energy for humanity is generated using horizontal solar photovoltaic arrays with an efficiency of 18% and which occupy 1% of the

If all of the energy for humanity is generated using horizontal solar photovoltaic arrays with an efficiency of 18% and which occupy 1% of the land area of the earth, what is the maximum population density that can be supported? Assume that the world's average per- capita energy use is 8.21010 J/person, and that the average worldwide insolation is 168 W/m 2

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