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It is planned to generate all energy needed by humanity from horizontal solar photovoltaic arrays with...

It is planned to generate all energy needed by humanity from horizontal solar photovoltaic arrays with a 20 % efficiency. If 1% of the total land area of the earth is to be used for solar panels, what is the maximum population that this energy system can support? Assume that the world average per capita energy use is the same as at present.

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