For centuries, the world's great rivers have been the quiet engines of commerce, carrying the weight of civilization from interior to coast. Now, under the pressure of persistent drought and deepening climate stress, those engines are faltering — the Rhine, the Yangtze, the Mississippi all running low, forcing a global reckoning with an infrastructure built on the assumption of water that is no longer guaranteed. The slowdown is not merely logistical; it is a signal that the physical foundations of global trade are shifting beneath our feet, and the costs — measured in prices, delays, and dimi