Visa's underlying currency (fiat) uses *zero* energy (paper notes).
False, quite some energy and other ressources are required for minting/printing and distribution.
Childish pedantry. How much energy do you think is used to print a hundred dollar bill? You think the FED is doing J/$ calculations before they fire up their printing presses?
Why care when you can make as big debt as you like - it would be childish not spending as much as you can get away with