How Much Land to Power The Whole World with Solar? (TreeHugger)
"Solar power systems installed in the areas defined by the dark disks could provide a little more than the world's current total primary energy demand (assuming a conversion efficiency of 8%). ...The colors in the map show the local solar irradiance averaged over three years from 1991 to 1993 (24 hours a day) taking into account the cloud coverage available from weather satellites." Note that current solar panels have an efficiency higher than 8% (more than double that, in many cases). For more info and details on the sources, see this page. Via Reddit. Thanks to Matthias Loster!
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