The price of energy is rising. Carbon dioxide emissions are rising. But there’s one thing that’s falling: the price of computing. In this issue, MIT Technology Review profiles the emerging business strategy that says information technology could be the cheapest way to save or create more energy. This report takes you into the smart electrical grid, showing you how to save gas in a driver-less car, and demonstrates how some nations are exporting renewable power in the form of e-mails and Facebook photos.