Bitcoin is estimated to use about the same energy as the whole country of Denmark[1]. Denmark has over 790 million cashless transactions with "Dankort", a local debit card, per year alone[2] - excluding other payment methods. Bitcoin can handle about 2,000 transactions per block[3]. 2,000 transactions times 6 blocks per hour times 24 hours in a day times 365 days in a year equals 105,120,000 transactions per year.

Congratulations, you just used the energy of the whole country of Denmark with _everything_ in it (housholds, heavy industry, etc.) to process less than a 1/7th of Denmark's cash-less transactions with a _specific_ (albeit widely used) debit card.

You see, your argument is simply invalid. "Traditional" banking is more energy efficient by multiple orders of magnitude.

1: https://arstechnica.com/tech-policy/2017/12/bitcoins-insane-...

2: https://www.nationalbanken.dk/en/publications/Documents/2011... (page 125)

3: https://blockchain.info/en/charts/n-transactions-per-block