They do - by comparison, existing financial systems use much less energy, which is why a popular "argument" is to claim that you should count military expenditu

They do - by comparison, existing financial systems use much less energy, which is why a popular "argument" is to claim that you should count military expenditures into it (which honestly makes no sense unless you believe in some weird axioms...) Another issue is that BTC siphons off the build up in green energy by wasting it - without miners setting up shop close by to turn your green energy into heat, you have to ensure you have either someone else nearby to sell (lots of real world focus on hydrogen energy storage recently as way to capture such excess) or invest in transfer capacity to clients.