Oh yes. I agree, there is probably ton of waste in the entire banking sector. I just wanted to clarify why each transaction most likely costs more in blockchain compared to one transaction in the traditional network.

I wonder how much energy we would consume if bitcoin would replace the whole banking sector? Back-of-an-envelope calculation: If it would be powering billion transactions per day, it would need 400 nuclear power plants to provide required energy.

I don't know if we should ban bitcoin or not. I don't have any strong sentiment towards it. But if the numbers here are right, I don't think it is a viable main stream currency.