One of the greatest promises of the high-tech future, whether made explicitly or implicitly through shiny clean concept sketches, is that we will have efficient energy that doesn’t churn pollutants into the air and onto the streets. But here in the present, politicians and even many clean energy advocates maintain that a world run on hydrogen and wind, water and solar power is not yet possible due to technical challenges like energy storage and cost. Yet Stanford University researchers led by civil engineer Mark Jacobson have developed detailed plans for each state in the union that to move to 100...