[Cooker]

I don't know if you are aware of this, but there have been numerous cases of exponential growth(or faster for instance 1/(t-t0)e^t) that level off abruptly. To extrapolate far when the slope is steep has usually been a blunder. If you fit current data trends, the World GNP will be infinite around 2025 and energy consumption will be also. My point is that some effects emerge rapidly to destroy and level off these apparent exponential growth curves. This can be seen throughout history, but the onset of other affects has often been hard to predict before hand. When Moore's law ends, I predict we will have the same speed computers for 10 years (conservative estimate).