It's too involved to reply here, once again I draw your attention to a book by Peter Sawyer called, The Green Hoax Effect". ask your library, search google for "Green Hoax" and read your heads off if you dont like libraries, Peter sawyer has been dismissed on some subjects but he isnt the only author of this subject, unlike many in the scientific community who are funded by Governments or Corporate Giants he has nothing to gain by his comments, lets not forget that there is no money to be made by scientists, they exist due to grants alone, take away their grants and they are over educated unemployed people. NASA wouldnt exist if it wasnt for government funds. (possible exception here is drug companies but thats another story). If you want to doubt my comment just look at the new CSIRO diet emploring you to eat tons of meat (and i aint no vege lover) that diet and all the research was funded by the Meat Board, yet our government tells us this is the best thing for us, no nutritionist in the world will recommend this diet and in fact they have been up in arms over it, it is a good example of what I'm talking about though.

For example, here's some questions.
Q. Why do we have catalytic converters on our cars?
A. To clean up our exhaust emissions by removing Lead.
Q. Who owned the worlds biggest lead mines?
A. Rothschild family enterprises. Why? in 1910 they realised by adding it our petrol it would stop pinging and high quality spirit could be replaced by cheap-to-produce petroleum or gasolene, they bought most of the lead mines.
Q. Whats in a catalytic converter?
A. It has a honeycomb of expensive metals in it which react with the gases converting them to more harmful gases than they started such as Sulpher dioxide (causing the rotten egg smell) but I digress, the metals is question are platinum (Pt), rhodium(Rh), and/or palladium (Pd).
Q. Who bought up and now owns the mines for these metals back in the early 70's? The same Rothschild companies that own(ed) the lead mines.
Q. Why not clean up fuel instead?
A. Coz us dumb consumers can pay for the converters when we buy the car and the rothschilds can go on selling us the metals and the petro chemical giants can keep making cheap nasty fuel and charging us $1.20+ for it.

For those that dont know, before petrol as we know it we used to burn spirit in cars that was much much cleaner and didnt need either lead or catalysts to achieve it but it cost more to produce reducing the profits of the fuel companies. I for one would pay more for clean fuel than pollute the air we breathe more by way of a cataytic converter, yes we removed lead but introduced a cocktail of worse chemicals, but you see the worse chemicals are invisable, it was mostly the lead that causes the brown smog in california.