CAIRO, EGYPT - December 09: A waste collector picks up his receipt from a weigh station which will determine how much he is payed for his load on December 09, 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. Families divide responsibility from collecting trash, sorting it, processing it, and either selling it to outside factories or processing it into final goods. (Photo by David Degner/Getty Images).