You may not find the “bitcoin vs centralized financial systems” parts to your liking, but this post goes a long way in explaining why straightforward comparisons to credit networks like Visa might not be the right way to look at the problem.
The question of bitcoin’s energy footprint is riven with misconceptions. Firstly, it’s a mistake to compare bitcoin to payment networks, and comparisons relying on relative energy use are spurious.
Second, metrics like the “per-transaction energy cost” are misleading because transactions themselves do not cost energy; nor does bitcoin’s CO2 footprint scale with transactional count.
Bitcoin supporters and critics alike should understand how the protocol works, so the energy costs and externalities of the system can be honestly appraised.