In the last decade, extremism has become a global industry on a par with organized crime and paedophilia. The appeal of extremism for those running it is simple enough- money, and a lot of it. A real extremist is a businessman, not an idealist.
Recent studies into toxicity of vehicle emissions have shown evidence of the effects of freeway pollution on mouse brain cells. This is a particularly significant test, dealing with a universal atmospheric situation, and the results are grim.