Bitcoin mining is considered environmentally unfriendly because it uses fossil fuel energy. If crypto or bitcoin mining uses solar energy or water, surely the mining will be environmentally friendly. In my opinion, in addition to the proof of stake system, using a proof of work system like bitcoin is also not a problem as long as it uses environmentally friendly renewable energy.
It's true that mining is not environmentally friendly, because the growth of bitcoin enthusiasts is getting higher, resulting in consequences that ultimately mining is a problem for now. Mining is very much, because it is very profitable so that they do not think about the impact that occurs from the mining. so that it becomes a spotlight that has an adverse impact on the environment.
maybe with the problems that occur it will open the mind to do updates (many alternatives that can be done) but maybe it can't be instant and it takes time to be able to change things that are already used to renewable methods. like it or not, there has to be an update in bitcoin mining because it is really needed to be able to not have an impact on the environment.