CAIRO, EGYPT - December 18: The dregs and impurities of aluminum are cooled in a pit on December 18, 2014 in Cairo, Egypt. Nestled under the cliff of Mokattam is Manshiyat Naser, or Garbage City. It is a majority christian neighborhood with an economy built on waste collection and recycling. They make a relatively good wage by selling tons of aluminum for about $240 a week. But the workspace is littered with danger putting them in a race to save enough money before they are injured. (Photo by David Degner/Getty Images).