Bitcoin doesn't use energy, it uses electricity. This is an important distinction because electricity can be produced in sustainable ways. It's also important to note that Bitcoin was designed with a feedback loop to account for varying levels of mining power. The computational effort required to create a block on the Bitcoin ledger auto-scales by the average amount of time miners are finding blocks. Miners will only mine if it's profitable to them. Thus, if the cost of electricity causes less people to mine, the amount of work required to produce a block will decrease in proportion. Bitcoin mining always finds an equilibrium.The real problem with these cryptosystems is that they derive all of their value from WORK performed and thus ENERGY consumed. Which in turn leads to ever-rising energy prices. Once that skyrockets out of control electrical resources may become so scarce that people will struggle just to keep the lights on. ("Can you spare a watt Brother?")
Proof of stake is contrary to decentralization. Bitcoin run by a conglomerate is no longer Bitcoin (it's EthereumThe obvious solution is to eliminate work-based schemes altogether. Proof of stake systems don't make money out of the thin air blowing out of a CPU fan as Bitcoin does. They don't require lots of energy and therefore much better for society as a whole.




