There are many ways to re-internalize the costs of CO2-producing energy use, such as putting a carbon tax on energy providers which emit CO2. In contrast, writ

There are many ways to re-internalize the costs of CO2-producing energy use, such as putting a carbon tax on energy providers which emit CO2. In contrast, writing specific policies to target (specific uses of) specific cryptocurrencies, without exempting the renewable energy used in their production, and without targeting other "frivolous" uses of energy, would be an inelegant approach.