Residents in Iran's capital Tehran are praying for rain in the midst of a severe drought. With record low rainfall levels many of the country's major reservoirs are less than 5 per cent full. The country's President Masoud Pezeshkian is warning Tehran faces evacuation if the winter rains don't come. But it's not all about the climate. Kaveh Madani is the Director of the United Nations University's Institute for Water, Environment and Health, and was also the deputy head of Iran's environment department. He told The World's Girish Sawlani what's happening in Iran is akin to "water bankruptcy".