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It's complicated. The power usage doesn't stay constant and it depends on hash rate and other things. I cant find a source for it but...
Forbes is saying here that the average carbon footprint of a bitcoin transaction is 369.49 kgCO2eq.
A return from London to New York is quoted at 986kg here. So yes it's within the same ball park definitely.
I also just came across this claiming that one bitcoin transaction produces the same e-waste as binning two iphones.So if you must invest in bitcoin do it through Paypal where it's just a number on your account and you're not in danger of locking yourself out of your wallet. Ethereum is also similarly terrible.
One single transaction? Is that correct?