Every evening, Ploy carried a bag of plastic cups to the bin, and the sight made her . Most customers took their drinks away, so cups were convenient, but they were also for the environment. Ploy wanted a that would not drive customers away. Ben told her about a café in his Wales that lent cups to its customers. Customers paid a small and got the money back when they returned the cup. Uncle Somchai thought the idea was . He said people were too to bring cups back. Ploy decided to test it for one month. She ordered fifty cups made of bamboo, and Jay designed a logo for them. At first, customers were slow to join. Then the cups became among students from the nearby school, and carrying one became a sign that you cared about the . Uncle Somchai admitted that he had been wrong. By the end of the month, plastic use had fallen . Ploy calculated the carefully. The cups were not only greener but also more . The bag Ploy carried to the bin each evening was now lighter.