I think I'm just going to quote myself here because I've made the same point too my times now.
Bitcoin's proof of work mining system isn't good for the environment and we know that but it's extremely unfair to use that against bitcoin because there's a lot more electricity pollution on a much larger scale by bigger government backed corporations. So even if bitcoin would become proof of stake it won't cancel out all the environmental problems.
These guys shouldn't be worrying too much about the power consumption of bitcoin. Because as we speak the world is being polluted right left and center but you don't hear a word. Just look up the Canadian tar sands. It's a disgrace.