Let me just ask one short one then, and talk about the efficiencies of wind power and solar power. From what I've been reading, it appears to me that the efficiency of that source of power is quite a distance away from being cost-effective in relation to the investment that's needed to produce that source of energy.
Let's take wind power, for example. You spoke about it earlier, Dr. Mead. It's my understanding that this is still far from an efficient source of energy to take the place of fossil fuels. Am I correct on that? If so, how far away is it from having an efficiency at a level where it's, say, comparable?