> Lightbulbs produce light and waste. Bitcoin produces block security and waste all consumption of energy produces waste, the question with lightbulbs is wheth

> Lightbulbs produce light and waste. Bitcoin produces block security and waste all consumption of energy produces waste, the question with lightbulbs is whether we can get more light with less energy and certainly from 100 years ago there was lots of progress. the same question simply doesn't apply to PoW currency, because energy expenditure is the goal since it directly converts into security. you can't ask for more security with less energy if security is defined in terms of energy. and that's exactly the case with bitcoin. if you want your metaphor to work - imagine a lightbulb that has a dimmable enclosure and it automatically dims proportionally to how many lumen is emitted so that luminosity of the whole device is constant. no matter how much energy you throw at it or how efficient you make the lightbulb - the apparent outcome is the same, therefore there must be something else this process gives you to justify expending this or that amount of energy.