Mitchell talks about using human urine in farming and says it's a terrific source of phosphorus which is a key nutrient for plant and animal life. She says we have a limited source of phosphorus in Australia. She says human faeces is not quite as nutrient rich as urine but it has a lot more carbon. She says it's good as a soil conditioner. She talks about health concerns. She talks about waterless urinals which are used in Sydney and says they are a mark of pride now.