According to https://digiconomist.net/bitcoin-energy-consumption, Bitcoin is currently at 42 TWh. That's over 20 million tonnes of CO2.

If we assume energy costs to produce annual supply of new banknotes and coins in entire world is at 1 TWh. You see how insane energy consumption of Bitcoin really is.

And that's comparing an entire money supply of the world to single cryptocurrency.

Banks cannot be part of the equation as the need for banks would not cease if the world would switch to Bitcoin or similar.