CAIRO, EGYPT - NOVEMBER 13: General view of smog over the River Nile and cityscape, viewed from the Sofitel hotel on November 13, 2012 in Cairo, Egypt. (Photo by Thomas Koehler/Photothek via Getty Images)
CAIRO, EGYPT - NOVEMBER 13: General view of smog over the River Nile and cityscape, viewed from the Sofitel hotel on November 13, 2012 in Cairo, Egypt. (Photo by Thomas Koehler/Photothek via Getty Images)