In 2012, the United Nations Food and Agriculture Organization (FAO) observed that, by the year 2025, up to 75% of the world's people (approximately 5.5 billion people) will be at risk due to insufficient water to grow sufficient food.1
Footnotes:
1) UN FAO, FAO Water Reports #38, Food and Agriculture Organization of the United Nations, Rome, 2012, ISSN 1020-1203.