And we forgot to consider the full resources needed by banks. Yes, banks handle more transactions than Bitcoin, but banks don't only use energy/computer power for its transactions, what about the storages needed, what about the indirect expenses. While your bankster sit down on his chair he does not pedal to produce energy, his office uses energy too, when he goes to toilets he uses energy too, the transport of money, paying the employees, emails sent, letters sent, and so, are something to take in consideration