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We could regreen the Sahara by covering less than 0.5% of it in solar panels and desalinating water. Grassland precipitation - 0.7 meters/year Solar irradiance (GHI) - 6 kWh/m^2/day PV efficiency - 23% Desalination efficiency - 3 kWh/m^3 (2.1 kWh/m^2/year)
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