Pardon me, but are we talking about the same car here?
As far as my own opinion goes, it is a far more energy efficient car then most of the vehicles available there - so where you got the idea of them being the one of the most if not the most dirtiest and polluting vehicles, I have no idea.
90019 is referring to life cycle (cradle to grave) emissions of CO2 and impact on the environment, for example in mining the minerals used in the battery pack (lead acid IIRC) There are so many different measures and models for measuring life cycle that it is far from an exact science. There are whole university departments dedicated to modelling lifecycle CO2.
Also the modest CO2 emission savings in use (the 89g/km is presumably the combined urban and extraurban cycle) are not so prevalent when driven "normally" i.e. over 30 mph for sustained periods; the Prius will emit similar volumes to any other car of similar weight with a petrol engine of similar size. You can't magic the energy from nowhere, it comes from the petrol at the end of the day.
Correct.
If you look at the real environmental cost of the Prius, it's not as rosy as they'd have you believe.
One of the main problems are the batteries, especially because of the high nickel content.
The mining of the nickel for the batteries is extremely polluting, then it gets shipped all around the world during the various stages of production. IIRC each battery lasts approx. 4 years, after which it has to be replaced with a new one, and the old one disposed of. I can't remember if they've actually found a way to dispose of them properly yet, last time I checked, they were being dumped near the factory, which had turned that small area into wasteland.
Thing is though, most people don't take it into account, but the production and disposal of cars are a significant part of their environmental impact. This is one of the reasons that the government's way of being green, by getting people to scrap old cars and buy new ones, is a flawed one; they're actually increasing the impact on the evironment by taking many roadworthy cars off the road and scrapping them whilst also encouraging an increase in demand for new cars to be built, and creating a lot of excess emissions and waste that would not have happened otherwise.
My friend went to a scrapyard to get a wiper motor for a friend's car recently, and was amazed by the number of perfectly good condition cars there. There are even cars in scrapyards now that still have MOTs, because people have been lured towards replacing them by the government.
If you really want to drive a green car, buy an old diesel and run it off second hand oil from your local chippy or somewhere like that. It keeps an old car on the road, reducing the waste from disposing of it and means one less new car is produced, saving a lot of energy. It is also a much better fuel to use, because, unlike normal biofuel, land is not being used for fuel instead of food, and you are using sometihng that would otherwise almost certainly go to waste. Interestingly, diesel engines were actually originally designed to run on veg oil, not diesel.
Your car may smell of fish and chips if you do get it from a chippy though
