Most of miners uses renewable energy, I see no reason making it as big problem as it seen or talked by elon, not to mention if bitcoin indeed fall then it's gonna solve its own problem which is energy consumption since there gonna be decrease in mining difficulty
and tbh, bitcoin is still developing and there's maybe a potential for it to release solution to this problem so rest assured the problem regarding energy consumption won't be bitcoin's down fall and frankly if we could find another source of energy in the future, does the current electricity consumption matters?
well lets hope it doesn't but here is something to think about, lets say BTC is 100% renewable energy from their own dedicated sources in the future.
You will still have a movement of users/consumers that will say why use BTC when I can Use XYZ coin and achieve the same transaction of digital currency
using 4 million times less power. I mentioned earlier that the power Industry was my business for most my career (30 plus years) and I still do some consulting
for Southern Company. I still bogles my mind that we could completely end all the pollution problems and all the energy problems with Nuclear. Thorium based salt reactors.
However the public wont allow it from unwarranted fear of Nuclear power. I also mentioned the Energy mortality rate per TKwhr and yet the public wont embrace Nuclear.
The point here has nothing to to with power and BTC. The point in this is public perception, and thats what can make a difference in the crypto world as much as it has in the power Industry world.
Energy Source Mortality Rate (deaths/trillionkWhr)
Coal – global average 100,000 (41% global electricity)
Coal – China 170,000 (75% China’s electricity)
Coal – U.S. 10,000 (32% U.S. electricity)
Oil 36,000 (33% of energy, 8% of electricity)
Natural Gas 4,000 (22% global electricity)
Biofuel/Biomass 24,000 (21% global energy)
Solar (rooftop) 440 (< 1% global electricity)
Wind 150 (2% global electricity)
Hydro – global average 1,400 (16% global electricity)
Hydro – U.S. 5 (6% U.S. electricity)
Nuclear – global average 90 (11% global electricity w/Chern&Fukush)
Nuclear – U.S. 0.1 (19% U.S. electricity)
It is notable that the U.S. death rates for coal are so much lower than for China, strictly a result of regulation, particularly the Clean Air Act (Scott et al., 2005). It is also notable that the Clean Air Act is one of the most life-saving pieces of legislation ever adopted by any country in history, along with the Fair Labor Standards Act (1938) which established the 40 hour week, and Medicare in 1965. Still, about 10,000 die from coal use in the U.S. each year, and another thousand from natural gas.
https://www.power-technology.com/features/nuclear-mortality-rate-safe-energy/