I think that when renewable energy will be widely used even to mine Bitcoin. People will be more calm and optimistic about Bitcoin. While it is being mined consuming so much dirty energy that pollutes our environment, there are a lot of people and organisation that are against crypto, but I think that it will become greener soon and people will change thier tune.
No, it will be easier for states to completely prohibit the mining of cryptocurrency that uses the energy-consuming PoW algorithm and they will not understand whether it is used, say, when mining bitcoin, pure green energy or not. Even if miners use renewable energy sources, greenhouse gas emissions will still occur. The situation with climate change has been raised very seriously and the states will cut very hard.