Water resources are being rapidly depleted in many countries around the world, including the western United States, and access to clean water is a common problem through out the developing world. But even in the context of worldwide fresh water depletion, Yemen’s crisis is staggering: Yemenis use about a fifth of the amount of water recommended by the World Health Organization for healthy and hygienic living; the capital, Sana’a, may be the first world capital to run out of its own water supplies; and thousand-meter wells have recently been drilled in the country’s highlands to get at so-called “fossil water.”