Easy solution: tax carbon emissions. Who cares if you’re using energy to mine Bitcoin? Or if you’re using it to play video games? Or to run the AC all day? If it you’re internalizing the cost of any emissions, then you’ll use those resources efficiently.
Hard to do this when you can have other countries with much looser regulations allow Bitcoin miners run rampant. What probably should happen is to make converting from any cryptocurrency to major world currencies a crime. I have no delusions that this will halt activity in this sector entirely, but it will make it reasonably difficult to make any substantial money this way without raising some serious eyebrows.
Lol.. and that will stop all crypto-world currency trading? Just like how making drugs illegal stopped all drug trade?