This whole subject really winds me up!
Whether or not CO2 is the problem, I don't understand how this is the best solution.
Surely, the best solution is just to put more tax on fuel? This way, the people who use more fuel (and hence, produce more CO2), pay more.
The people who do little mileage (I work from home, so don't commute, for example) pay a proportionate amount to they CO2 produce.
Not only will this encourage people to use their cars less (that's what the greens want, right?), but it will stop occasional users getting stung too.
IMO, if they want people out of their cars, they have to make the costing more related to the amount of fuel used (and emissions generated). I mean, why are you going to use a train when you've paid £400 a year to have a car on your drive?!
I now doubt the CO2 argument also having listened to recent documentaries about this. There certainly should be more research and I get the feeling it is not being done as the government would rather just get the tax off us instead, while hiding being dubious "evidence".
I think this stinks of using too much stick and not much carrot once again.