Re 1 and 3, I think Isuzurover beat me to it.
1. Same question as previously, the claim that health in rural areas is worse than in urban areas, (As with morbidity for London Vs LA) is this documented study you're quoting, or once again, your gut feel?
2. In addition, I'm not arguing the relative treatment costs of alcohol & tobacco related ilnesses Vs petroleum related ones. All I'm saying that health costs associated with petroleum product emissions far exceed the levies collected on them. One can therefore hardly argue that its not fair that people who use more fuel shouldn't be making a greater tax contribution (through fuel levies).
Furthermore, when you say "I'm not saying that particulates are not harmful to your health"... You're really saying that you agree that they are harmful to our health. Are you not? Because if so, (and it would be hard to argue otherwise, given the large body of PUBLISHED evidence showing it is) then you'll also agree that there is a cost burden associated with the health care system (which the government pays for). Please note that we're only talking about economic "costs" for providing health care to treat petroleum related pollution ilnesses. As Isuzurover rightly points out, this does not take into account "costs" to our health, the impacts it has on our quality of life, as well as life expectancy. How does one put a dollar value of that?
5.) To be honest, I've always assumed, but never actually bothered to check. Considering that I'm debating relative rarity of various precious metals with a retired geophysicist, I thought it prudent to check the facts. Here are my results:
Crustal Abundance of palladium 0.015ppm
Crustal Abundance of platinum 0.003ppb
In all honesty, the estimates I got for platinum varied between 0.003 and 0.005 ppb (parts per billion).
Compare this to abundance of palladium of 0.15 ppm (parts per MILLION), it is between 3000 to 5000 times more common than platinum, so sorry but you should check your facts.
In any case, we're straying so far away from the arguement I'm trying to make. It's viable as a future "source"... I'll call it an energy storage medium, for fear of another off-the-track arguement.