but if areas do proper watershed management it's just fine.
True. However, no one does. None of the agricultural methods used in large scale agriculture use any kind of watershed management. They just keep draiing the water from the aquifers and not worrying about replenishment rates. It isn't about rain. Its about water access to provide more food than rain can do. Rainfall isn't reliable for large scale agriculture. In many areas where agriculture thrives rainfall is completely insufficient for crop growth. Especially for places like China and India. The solution is to dig into the aquifers for supplies. The problem is that we are past the replenishment level for most of them and are draining water from locations where it was deposited millenia ago. The hydrologic cycle isn't capable of replacing at the level we are draining. If we stop draining aquifers and rely on rainfall for all production then production decreases to the point where it isn't sufficient to provide the level of food required. Simple fact. We are withdrawing water faster than the natural system works. The water in the aquifers is limited. Once they are depleted we are faced with the more expensive alternatives. Price of food skyrockets and production falls. Only the rich can afford food and the rest of the people starve.
Neutrinos have bad breadth.