But that electricity is cheaply available. We could stop bitcoin's use of electricity overnight, if electricity began to cost more than the expected return on

But that electricity is cheaply available. We could stop bitcoin's use of electricity overnight, if electricity began to cost more than the expected return on investment. And this will inevitably happen anyway, since bitcoins only get harder to mine over time. This is a temporary problem. Honestly it seems more like "bitcoin is a way to launder stolen electricity" rather than "oh noes, if people keep mining, eventually they'll have a huge impact on global energy consumption"