What happens when costs get high? People innovate! When demand for bitcoin increases, more money will be invested in cheaper and more abundant power sources.
Isn't it? I see a lot of investment in decoupling supply chains from China which was a single point of failure and contributed to inflation when it closed down. Also a lot of investment in renewables or alt-energy sources after Russia decided to use NatGas as a tool in its current war.
Market forces don't really discriminate one innovation over another by whether it's socially desirable to you or me.