firstly bitcoins annual consumption is NOT 54.6

heres some math
using 2018's main asic of s9. which is 14thash for 1.3kwh
(there are more efficient asics now but lets use the LESS than efficient, just to prove the point)

at bitcoins PEAK it got to 62exahash. note: PEAK not constant
so 62exa / 14thash = 4,428,571 asics
4428571.428571429 *1.3khw = 5757142.857142857kwh
=5757.143mwh
=5.757gwh

so at the very peak bitcoin was using 5.757ghw each hour
now if that peak was a constant 62exa hash every hour of every day for a year
=50432.57142857143gwh a year
=50.432twh/year

thats 50twh AT PEAK.
but we all know that bitcoin right now is not using 62exahash right now
but w all know that bitcoins hashrate went down to 36exa in december
we all know that bitcoins hashrate was as low as 27exahash this time last year

which puts the YEARLY consumption between 22twh to 50twh
having exported a year of exahash data and using the math of the less than most efficient asics available now but most popular for 2018 to be fair.
and actually doing the math
we get
34332.86065gwh a year
=34.333 twh a year NOT 54.6twh

next. large amount of hashrate is powered via renewable energy. so feel free to cut the co₂ number down by more than half of what the topic post wrote.

by the way, pepsi lease out their logo'd refrigerators to fastfood restaurants and the electric utility to just keep pepsi cool. far exceeds keeping bitcoin secure.

so here is a question. for a beverage that just ends up being body temperature urine eventually. vs bitcoin which is an immutable international currency. which is wasting more electric