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Just like we saw with the lockdown policies.

Heavily tax mass transit but allow private jets, etc.

Mass transit isn't taxed, it's heavily subsidized by taxes.

Often but not always; Hong Kong is one of the exceptions I think (at least the MTR)

Also, the parent is probably talking about EU intent to apply carbon tax to mass market airlines but exempt the private jets

The tax should be simply applied to the carbon content of the fuel.

Use the revenue to subsidize green projects.