"Our energy system depends on water. About half of the nation’s water withdrawals every day are just for cooling power plants. In addition, the oil and gas industries use tens of millions of gallons a day, injecting water into aging oil fields to improve production, and to free natural gas in shale formations through hydraulic fracturing.". (Source: NY Times)
Good story in NY Times on how water problems will become energy problems.
A resilient civilization will thrive by relying on technologies and lifestyles that require less water and fuel per capita. Millions of people and thousands of organizations have begun this profound change. My book “Los Angeles: A History of the Future” describes a scenario by which our largest cities can systematically rebuild toward balance with nature: http://www.paulglover.org/books.html