I am glad that the bitcoin community doesn't see much value in POS yet. Apart from the obvious security issues you can't just swap it without seriously disrupting the power balance in BTC. Also POS works for the rich. There is a point that your earnings from staking become more than your life expenses and you just keep stacking more and more without taking any risks. Your children's children can do the same. Voting rights depend on the amount of stake too. As for how much greener it is I am not sure about that either. In bitcoin's competition between miners the winner is the one wasting the least energy. You can't beat a guy using the excess of his photovoltaic by burning oil. Not to mention the technological advancements that pop up because of this. Critical achievements can be accomplished in renewables just because there can be instant and easy gain.