1. Get an international coalition behind a ban on PoW mining. Would make sense as part of a climate agreement. 2. Once enforcement crashes the hash rate, fire

1. Get an international coalition behind a ban on PoW mining. Would make sense as part of a climate agreement. 2. Once enforcement crashes the hash rate, fire up government controlled miners to perform a 51% attack on BTC. Repeat as many times as it takes to make the point. The question is, which states need to be convinced to join the coalition, and how hard is that? I can see pariah states like e.g. Russia seeing an opportunity in encouraging mining instead of banning it.