I suggest that you take the effort to find out the facts behind the government and motor lobby propaganda. That is completely untrue. Here are a few of the major reasons, but I shall not follow up much. If you want to know the science behind what I am saying, I will answer if I can, but I will not play Blair and Howard.
1) An increasing number of cars are fitted with power steering and brakes, and (worse) air conditioning. In addition to increasing the fuel consumption, it means that engines need to be left running when the car is stopped in traffic. Not all are as bad as Citroen, but it is now rare for engines to be switched off in traffic jams. 2) Catalytic converters virtually eliminate carbon monoxide, but increase the amount of nitrogen oxides. Worse, they work only after the engine has warmed up (about 5 miles) and the average trip in the UK is about 3 miles. Also, they don't work at all well when the engine is idling (see (1). The reason that they "reduce pollution" is the the government is very careful to measure only what they do reduce.I will give you that an INCIDENTAL effect has been the removal of lead and sulphur but, as someone with breathing problems, I can witness that pollution for a given amount of traffic is getting worse.
3) The various regulations have the effect of increasing the weight of vehicles, discouraging more economical two-wheeled transport (both motorcycles and bicycles, ridden on the road). I believe that it would now be cheaper for me to get a HGV licence than a motorcycle one, and I am a very "low risk" person. And cycling is now finished, as a form of medium-distance commuting (3-10 miles), and that is DIRECTLY due to the changes in regulations and attitudes of the "powers that be."Other people have pointed out the errors in your "pollution-free" car theory. All it does is move the pollution from the suburbs to the power station, though I agree that doing so COULD be used to reduce pollution. I know of no plans that any government has, and definitely not the UK, to do so.
Regards, Nick Maclaren.