Comment by dataflow

I'm gonna go out on a limb here and say maybe we should in general ban things that are a certain amount less energy efficient (say, 5x more wasteful) than the best technology we've achieved for a similar purpose so far. And progressively tax anything that's moderately more wasteful (say, 2x-5x). It's bad enough that we have cars on roads that are twice as wasteful as they could be, let alone a transaction processing mechanism that is literally a million times more wasteful than our existing technology.