A recent study claims that available wind resources are much larger than that needed to supply global human energy demand. Mark Jacobson, et al., “Saturation wind power potential and its implications for wind energy,” Proceedings of the National Academy of Sciences, September 2012. Stanford University and University of Delaware researchers apparently used a computer weather model to demonstrate that there is enough wind in the world to exceed the total demand for energy by several times. They predicted that 4 million wind turbines, each operating at a height of 300 feet, would provide more than half of the world’s power demands. According to the authors, as the number of wind turbines increases over large geographic regions, power extraction first increases linearly, but then converges to a saturation potential not identified previously from physical principles or turbine properties. The study cautions, however, that “wind is unaffordable, unreliable, and uncompetitive without subsidies” and ultimately “costs more than getting electricity from a conventional source.”