Yes, looking at my comment again I see I wrote 40 x 10 = 40, rather than 400. That's closer to the total energy use of all proof-of-work cryptocurrencies, and

Yes, looking at my comment again I see I wrote 40 x 10 = 40, rather than 400. That's closer to the total energy use of all proof-of-work cryptocurrencies, and not a fifth of Bitcoin alone as I suggested.