Groundwater is relied upon for roughly half of global drinking water. And as climate change alters precipitation patterns and pollution of surface water continues to increase, our collective dependence on groundwater is likely to increase.

Getting ahead of the potential conflicts, or in some cases, catching up with them, requires an increase in effective groundwater cooperation and diplomacy. Yet the vast majority of transboundary aquifers exist without any form of agreement among the states that share them. This state of affairs leaves the aquifers—and the people who rely upon them—vulnerable to overexploitation, environmental degradation, and the risk of interstate conflict.