California’s drought has reduced their supply to one year’s consumption. The drought has been severe enough, and conservation has not saved enough that a prolonged drought, which is definitely possible, or a major interruption, like an earthquake damaging reservoirs, can make the state’s situation ever more dire. California’s economy and population are larger than many countries. Without sufficient water, there would be significant global disruptions in food production, the state’s IT and other industries, and a mass migration. The best solution; rain. The backup plan; rain. What do they have no control over; rain.