Actually it depends on how you look at it. On the surface, Chia is not as power intensive when you are mining it, as compared to say Ether and Bitcoin. But the very fact that it kills SSDs really quickly means miners will always have to buy new ones in order to grow. And producing a SSD requires substantial power. You can argue that it requires power to manufacture a graphic card or ASIC as well, but they don't fail that quickly if they are sufficiently cooled.Oh I agree with you totally, there is no way anything that relies on tech to run today is gonna be greener than not having to run it in the first place. But I believe I also said it was only 'greener' when compared to current PoW favorites like BTC. I think one of their devs has mentioned an analogy to that very effect: Tesla cars aren't green when compared to running a bicycle, but they are still greener than your average gas-guzzler.