There's probably some well established hand waving routine that's played whenever energy comes up. Perhaps there's some paper that starts with a ridiculously hi

There's probably some well established hand waving routine that's played whenever energy comes up. Perhaps there's some paper that starts with a ridiculously high first guess for energy demand and then goes through a list of reasons why it would not be quite as bad, concluding with some multiplied percentage of how it would be so much better than expected. Certainly including the old "photovoltaics use a wider spectrum than plants, so if we take the best panels, re-emit the energy at a wavelength that matches the plant's chemistry we could get more from a given square unit of sunlight if everything else was free". Last five words conveniently omitted.