Earlier quoted context omitted.
Bitcoin's energy consumption depends on mining revenue. Currently the main component of mining revenue is block reward. Block reward will go to zero over time. How much energy Bitcoin will use then is not known today. It is a new experiment that mankind is performing for the first time. The old financial system is not very efficient. In the USA alone, millions of people work in the finance sector. Automating those ta…
When you say over time are we talking next year, decade, century? I don't really follow Bitcoin and friends, all I know is it uses more electric than some countries
The current plan is to halve the block reward every 4 years and completely stop paying a block reward in 2140.