I think the point is simply that since bitcoin mining takes energy, the search is on to pursue lower cost electricity. It obviously takes energy, like many other industries.
Plus the general internet electricity which bitcoin can’t function without. There’s no way it uses less electric than the other forms of digital money (debit cards, EFT, etc). So at best it’s a net zero.
Not sure. There is a whole infrastructure to support the fiat money system - Fed, Reserve banks, banking, etc.
And a whole infrastructure to support bitcoin. If it becomes the general currency the banks are involved, all the banking system of the stores. It won’t be different. Only thing it avoid is the physical production and distribution, which is such a small fraction of the money running around in the world it barely rates.