But in the future, the amount of energy consumed for a single transaction will tend towards exactly the fee paid for that transaction multiplied by the cheapest electricity price in the world.
So either the transaction fees will be outlandish, or for a transaction that costs $0.10 you will consume roughly 2kWh.
Trip to the shops, but fuel, some take away and a few things online when you get home and you’ve used 10-16 kWh of energy, multiple that by a population (even a small one), and even the massive investment into renewables that there is now will be quickly eclipsed.
Adding transactions that are so intensive to people’s everyday energy consumption would be a huge step backwards IMO.
Making a bitcoin transaction is like recasting gold bars - not something you want to do often with small amount of gold. This will be done only for large individual payments or for large settlement payments aggregating thousands or millions of normal payments. Everyday payments will be performed on second or higher layers (e.g. Lightning Network)