A cargo of discarded plastic bottles from the United States arrives at the port of Tianjin, the largest in northern China. From here they are sent to Hebei province, close to Beijing, to be sorted and melted down into plastic pellets. These are then sent south by road to Zhejiang, where they’re moulded into cigarette lighters. The spark wheel is inserted in Jiangsu. Finally, in Shanghai, they are packed onto ships, destined for sale in Europe.