A Saudi man walks on a street past a field of solar panels at the King Abdulaziz city of Sciences and Technology, Al-Oyeynah Research Station, in this May 21, 2012 file photo. REUTERS/Fahad Shadeed/Files
File photo of a Saudi man walking on a street past a field of solar panels at the King Abdulaziz city of Sciences and Technology, Al-Oyeynah Research Station
