地表水资源，包括脱盐海水和回收废水，弥补不了水资源供应和需求之间的全球差额 — — 预计到2030年水资源供应和需求之间将相差40%之多。
Surface water resources, such as desalinated seawater or recycled wastewater, will not close the global gap – predicted to reach 40% by 2030 – between water supply and demand.