How much research have you actually done? I was studying this very topic two days ago.
The global banking system uses 4x more electricity than bitcoin does and is nowhere near as safe.
Though I do agree they both use a lot of electricity.
Safe is a relative term, my bank account is FDIC insured to $250000.
Any Bitcoin , I own is not insured, if I lose the password, then it is gone
if I get hacked , then the bitcoin is gone.
If I die, and my children don't have my password, then bitcoin is also gone.
So in my existence, FIAT is safer.
Lose my bank password, the bank will reset it.
if the bank gets hacked, the funds will be restored.
My children can use the legal system to gain access to my bank account after my death.
So safe is not a good term.
You can say bitcoin is a good hedge against hyper inflation of fiat,
but so is oil, gold or any other commodity.