Kaveh Madani warned Iran about water scarcity 20 years ago. He was called a "water terrorist." Now Iran is experiencing an extreme water crisis, its like not seen for more than six decades. Tehran, famous for its surrounding snowy mountains, has had no rain in over 200 days. Its main water sources are in a dire situation; two major dams supplying the capital are at less than 10 per cent capacity. Kaveh Madani is the director of the United Nations University Institute for Water, Environment and Health, and warned of this situation back in the early 2000s, and he's speaking here to SBS broadcaster Niv Sadrolodabaee.