I think the issue with carbon taxes is a 10-20% reduction isn't enough. A 75% reduction is needed. Which means some sectors the reduction will have to be more than that.
At that point bans make more sense.
At that point bans make more sense.
Also, not every 20% is the same. 20% reductions in emmisions because 20% of the fleet is electric-from-solar is a lot closer to 100% than 20% because of lighter cars and more efficient ICEs.