It could be done gradually. The first step is to introduce the assessment and remittance infrastructure. Governments could then choose to start with a 95% disco

It could be done gradually. The first step is to introduce the assessment and remittance infrastructure. Governments could then choose to start with a 95% discount on the fee for example, and ramp it up over time. It could also choose to reduce the fee or entirely exempt certain products. You could see these as "environmental subsidies" on things that we consider important. The important thing is that costing in the environmental economic externality[1] would become the norm, rather than the exception. [1] https://en.wikipedia.org/wiki/Externality https://en.wikipedia.org/wiki/Externality