The idea of collecting cardboard boxes and used paper in exchange for a few pennies was never something Kuang Su-ling thought she would have to do for a living. It is a laborious occupation that involves working long hours and travelling inconvenient distances, often in difficult outdoor conditions. But Kuang became a waste paper scavenger after she was diagnosed with diabetic eye disease seven years ago and lost her job as a cleaner. “I could not find any other work and I needed money to cover...