I quite like the idea of progressive carbon taxes btw. Everyone has an annual allowance for basic living necessities-this may include eg driving their old car to work or hearing their house.

Anything on top - air travel, second homes, big cars etc - you pay for the carbon.

Maybe doesn’t sound like it’s converting to 0, but at least it differentiates between optional and essential fossil fuel use (or socialises the cost of carbon removal if you prefer).