随着美国西部地表水的减少，人们正在钻更深的井，并利用可能需要数千年才能自然补充的古老地下水。
依赖科罗拉多河的社区正面临水资源危机。米德湖是该河最大的水库，自大约一个世纪前修建胡佛水坝以来，水位已降至前所未有的水平。亚利桑那州和内华达州正面临有史以来第一次强制停水，而其他水库正在释放水，以保持科罗拉多河的水电站运行。
如果即使是强大的科罗拉多州和它的水库也不能免受气候变化加剧的高温和干旱，西方从哪里得到水？
有一个隐藏的答案：地下。
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随着气温升高和干旱使河流干涸和山区冰川融化，人们越来越依赖脚下的水。地下水资源目前为全球近一半的人口和大约 40% 的灌溉用水提供饮用水。
许多人没有意识到这些水的年代久远以及脆弱程度。
大多数储存在地下的水已经存在了几十年，其中大部分已经存在了数百、数千甚至数百万年。较老的地下水往往位于地下深处，不易受到干旱和污染等地表条件的影响。
在城市发展、人口增长和气候变化的压力下，随着较浅的井干涸，旧地下水变得越来越重要。