To mine the bitcoin is very much needed electricity to use, but I think there will be a way to mine another coin that is more power efficient.
So true. We cannot only use the non-renewable resources to be the only source of energy. People can also used other forms to create electricity. Everything here is in deep need of electricity therefore we cannot really control it because it is a necessity. So the only thing we can do is to find alternatives.
Technology will also find its way into the GPUs and bring the computing power more faster and efficient level. I do believe though that bitcoin mining now is very power consuming. Imagine, at this level of adaption, it already consumes this amount of energy at approximately 4 TPS. I sure hope they find a solution soon.