In our report, we say that up to 3.5 billion people live under conditions of water stress at least one month a year," he told the BBC.

UN Under Secretary General Usha Rao Monari, who is the official host of the UN Water Conference, told the BBC that resources would need to be managed more carefully in the future.เว็บคาสิโนยอดนิยม

"There is enough water on the planet if we manage it more effectively than we have managed it over the last few decades," she said.