India and Mumbai's biggest slum is known as Dharavi. There are a million people crammed into one square mile in Dharavi. At the edge of Dharavi the newest arrivals come to make their homes on waste land next to water pipes in slum areas.haravi has a recycling zone. It is claimed that Dharavi s recycling zone could be the way forward to a sustainable future. Everything is recycled from cosmetics and plastics to computer keyboards. 23% of plastic waste gets recycled in the UK, in Mumbai it is 80%.