This is also one of the ways a government attempts to promote clean energy: by banning, in part or in whole, a source of dirty energy, people can either do with

This is also one of the ways a government attempts to promote clean energy: by banning, in part or in whole, a source of dirty energy, people can either do without... or switch to a clean-energy source. Instead of electric vehicle tax credits, which cost the government in question an increasing amount of money as more people use them, you could apply a similar force with an ICE tax on purchasing new ICE vehicles, which raises a decreasing amount of revenue as people stop buying ICEs in response.