[meowface]

It's estimated ~39% of total Bitcoin mining uses renewable energy, as of September 2020. It might be higher now due to all the electricity usage attention in recent months, but as long as it's under 90 - 95%, there'll be a lot of criticism.

IMO it's inevitable Bitcoin will face increasing pressure to plan a transition to PoS. Especially if Ethereum's PoS transition goes well and the network is running successfully for at least a year afterwards. (And at that time, Bitcoin's total electricity usage might be much higher than it is now, also.)

But I also predict the community and devs won't even consider the idea, and that this'll manifest as mutually escalating tension and hostility between the different cryptocurrency communities, news media, social media, etc. It's already pretty polarized, but I think it could get much worse. Especially if Bitcoin's price starts to rise more slowly or drop and Ethereum's starts to grow more quickly or surpass it.