But there is hope that soon the situation could change significantly in the near future.
In March, there was an interesting announcement in the mining industry: Two mining companies, DMG and Argo, are joining forces to build the first mining pool based on renewable energy, called Terra Pool.
Only companies using hash power coming from renewable energies will be admitted in Terra Pool. According to statements of Argo in late April, the pool should be operative by the end of the quarter (thus, in June). Mostly they will be using hydroelectric power, Argo just three days ago purchased data centers in Canada to operate mining equipment based on hydropower.
If this pool is successful, I can imagine a chain reaction, with several mining companies to join Terra Pool or other similar initiatives. While they may have still small price advantages using energy from old coal-based power plants, joining a "green" pool can give them advantages like a regulatory certainty, and the price advantage is smaller every month due to the constant price decrease of renewable energy generation equipment. Remember that the U.S. State of New York introduced stricter regulations for the eco-friendliness of mining companies, and similar regulations could follow in other regions.
Maybe even Chinese pools could follow the example, as there are also regulation attempts in this region. And once we achieve 100% renewables-based mining, then the whole "energy consumption" discussion will stop.
What do you think? I think someone should tweet Elon Musk about Terra Pool and similar initiatives
Using renewal energy only , would end the carbon footprint issue,
but it would not end the issue of driving of energy prices for everyone else on that specific power grid.
Which leaves one of the major reasons PoW mining gets banned.
Reference: https://www.theverge.com/2018/3/16/17128678/plattsburgh-new-york-ban-cryptocurrency-mining
While Bitcoiners don't like PoS, so far it is the only solution that fixes all of the energy waste issues.
There was once mention of work being done on a new PoW design that used light instead of electricity,
I have heard nothing about that for years, so I guess it failed.
The only solution that seems possible with PoW, is regulations limiting who can mine , and how much electricity they are allowed to use.
Once that happen , bitcoin would be a centralized system, which I would hope even the most die hard PoW supporter can recognize PoS is a much better solution than centralized regularization and full government oversight , as Bitcoin would be no better than fiat then.