Bitcoin Emissions per transaction was described by Cambridge University as "not helpful" but Emissions per Dollar is far more helpful. As we can see Bitcoin is looking by far the most efficient

when compared to the banks, even if we forget about the emissions accrued from resulting investments.
How many gCOโ does it take to send a Dollar ?
Comparing efficiencies of new & old technologies is difficult, especially as bitcoin is still evolving. When measuring Banking, should we account for the resulting emissions from financing ? I think yes, because due to inflation caused by money printing you are effectively forced to invest just to maintain value rather than just saving. I do not think it fair to award all of the emissions resulting from investment, so I've only award 25%. Also shown with out. Either way Bitcoin wins.
gCOโ per Transaction = Banking emissions per year / Banking Transactions per year
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gCOโ per $ = gCOโ per Transaction / Average credit card transaction value