Iran is grappling with its worst water crisis in decades, with officials warning that Tehran, a city of more than 10 million, may soon be uninhabitable if the drought gripping the country continues.President Masoud Pezeshkian has cautioned that if rainfall does not arrive by December, the government must start rationing water in Tehran."Even if we do ration and it still does not rain, then we will have no water at all. They (citizens) have to evacuate Tehran," Pezeshkian said on November 6.The