Good post man, very informative. Interesting to see that Ethereum is still way below Bitcoin in terms of energy consumption. Maybe in the future we`ll see the trend shift from PoW to PoS to be more environment friendly (would be good to see some data on this one with just nodes running to stake).
Do you want a real environment friendly cryptocurrency? Check
Burst's website. The coin can be mined using your hard drives. The power consumption per transaction is very much lower than that of BTC. BTC consumes 205 KWh of electricity per transaction, Burst can do that with only 0,5 KWh.
It has not been having the attention it deserves from my perspective. But maybe soon it will, once the PoCC starts announcing their new proposals and updates.