Every year across the globe, we dump a colossal 2 billion tons of waste. From our leftovers at breakfast, to the houses we live in – and all the stuff we have inside them – everything we use eventually ends up as rubbish. But what we chuck away has got to go somewhere. In this ground breaking series we uncover a vast hidden world of waste and meet the secret army of workers operating a network of huge machines and hand-sorting on the front line, clearing up after us, day in and day out.