When someone buys a car that uses gasoline or diesel they just commuted to dumping 50 to 100 tons of CO2 into the air. Putting an excise tax on those cars tilt

When someone buys a car that uses gasoline or diesel they just commuted to dumping 50 to 100 tons of CO2 into the air. Putting an excise tax on those cars tilts the decision to buy gas vs electric strongly away from gas. Which is what you want. The other thing is it sends a very strong signal to manufacturers that they need to stop producing them. Remember the cost of carbon taxes isn't something they pay. The consumer most of whom suck at accounting are the ones. And punishing people that bought a gas car ten years ago is pointless and immoral. Because they already bought it. And they did so in good faith.