My take on this matter is very simple and I'm sure that everyone with a vision will agree with me. Energy is not a non-regenerable resource. Fortunately it is abundant in our world and we should leverage it as much as possible. While I don't agree with producing energy from fossil fuels, we have all the green energy production systems which are more fiable than fossil fuels in many areas. And I do think in 5-10 years the majority of energy produced will be green energy so I wouldn't worry too much about how much energy is the Bitcoin network consuming, although it is a good thing that people are coming with solutions like LN.
Although energy is not a non-regenerable resource, but in mining most of the electricity is wasted as heat, not calculation, and those heat has basically no use if not used in heating of the house in north. And since entrophy always go up in the universe, means a reducing of the total energy level, it is better to generate as little heat as possible, for the benefit of the planet
Suppose that you have 1000 dollar, you could just put those dollars to buy POS coin and into Staking, start to earn staking income, same as mining, and it might take 10 years to ROI. However, in a POW coin, you have to use those dollars to buy lots of mining rigs and electricity, wasted all of them to get some mining income, but your ROI time will be faster, most likely in 1-2 years
Suppose that you have 1MW electricity, you could just put those electricity into mining farms and mine bitcoins, ROI in about a year. And in case of POS coin, you could put those electricity to usage, like selling them to power a small village, and receive money to buy POS coins and stake them, ROI in about 10 years. But in this case, your electricity has helped some other people to do something, not totally wasted
By this comparison, POS coin does not burn energy, and its ROI is much slower, POW coins burn energy and ROI much faster