As I said, you can damage the environment providing you can afford to pay for it. It is just tax talk. Anything raised by such levies will get swallowed up into the Treasuries coffers.
I don't think anyone except a few greenies is fooled by it. As you point out, any extra tax revenue will be completely wasted as usual. Mr bloomin' Brown & his cronies will be rubbing their hands in anticipation. They're going about this in completely the wrong way. If they want people to take this seriously they should give them an incentive. For example: by reducing taxes on environmentally-friendly vehicles. Of course, they will never do that.