How a Reservoir Became a Border

We tell the century's story in reactors and qubits, but the plainest thread is older and wetter. A generation ago, the reservoir behind a city was infrastructure; today it is nearly a frontier. I have spent this year tracing how that conversion happened — not in one rupture but in a thousand ordinary decisions, each reasonable, that together turned a shared resource into a bargaining chip. When a corridor of desalinated water became the difference between a habitable megacity and an abandoned one, it stopped being plumbing and started being sovereignty, which is the argument now moving through the Concordat's drafting rooms. The migrant count past 112 million is, read one way, simply the sum of places where the water stopped arriving. Historians will not remember this decade for its cleverest machines. They will remember it for whether we learned, in time, that a thing everyone needs cannot belong to only some. The reservoir was never only water. It was the test.