ISTANBUL -- Driving along the E5 highway, this ancient city's jumble of concrete block high-rises and Ottoman-domed mosques recedes into the distance. The future gleams. Sleek luxury condominiums and shopping malls tower over modern new suburbs. Fueling Istanbul's growth -- and, as the country's economic center, Turkey's development, as well -- is coal. Even as the country works to take advantage of its location between Europe and Asia to become a regional energy corridor, the government is also banking heavily on coal to power the future.