As China undergoes its historic drive toward urbanization, it is also witnessing the rapid accumulation of urban garbage. The nation’s 668 cities generate an estimated 150 million tons of rubbish each year, accounting for roughly one-third of the world total, according to Beijing Review. Currently, as much as 7 billion tons of this garbage remains untreated, and two thirds of China’s cities have been inundated by rapidly spreading garbage mounds.