I’ve spent my whole life in the urban northeast, which is both soggy and light on water-intensive economic activity, so I haven’t spent a lot of time thinking about water use or water scarcity. But large parts of the United States are arid or support water-intensive industries or both. Also, a lot of policy controversies relate to AI these days, as AI involves a lot of data centers, and data centers typically use water for cooling purposes. And the intersection of these issues has given us headl...