Then he bent over and immediately rifled through his papers. "We'll have to use it, too. There's charcoal here, but we'd have to chop down every forest to get enough to use it as fuel. There's a little coal, but not nearly enough coal production to fuel a single smelter, let alone a nation of them. And even if we used coal, then we'd still want magical assistance to coke it. Not to mention scrubbing the exhaust of all these processes. I won't poison this nation's air and water or turn Canterlot's bright buildings black with smog."