A carbon tax is a non starter in democratic countries because we have seen over and over again that raising the price of motor fuel is political suicide. Canada had to back off on a program that offered a carbon tax back as a rebate. Similar outcome in France with Yellow vest protest movement. Many countries have tried to get rid of fuel subsidies only to spark middle class street protests. In the US the main election issue in 2022 will be "inflation" which for many voters is the price of gas. Carbon taxes simply do not work in the real world.