"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.
According to the most recent UN climate report, published Monday by the IPCC expert panel, "roughly half of the world's population currently experience severe water scarcity for at least part of the year".
Mr Connor told reporters that "uncertainties are increasing" when it comes to global water supply.
"If we don't address it, there definitely will be a global crisis," คาสิโนออนไลน์ อันดับ1