While I don't know the numbers, I'd guess that traditional financial systems all together probably are processing orders if magnitudes more transactions. So while a pure total energy consumption comparison is one thing it would be interesting to conpare energy consumption on a few different factors:
- total energy consumption
- energy consumption per transaction
- energy consumption per user
- energy consumption per $ amount transacted
Not saying traditional finance would come out on top, I'm legitimately curious
Wouldn't the "no postage required" business reply label link to the original mailing anyway, i.e. clould that not be linked to your address?