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It will all be solved when the oil runs out anyway :-)
What can you do about reducing the CO2 unless you have a hybrid?
What we need are cheap hydgrogen fuel cells.
So the trade off is to allow the NOx and unburnt hydrocarbons in the countryside but have less CO2 and burn less fuel in this case. I see the point and it's a good thought to use the GPS technology to control this. It does not seem nice to exhaust these nasty things anywhere though and I wonder what percentage of the world's total greenhouse gas output would be reduced by, even if this were universally adopted.
I think the nasty NOX and carbon monoxide products only create local smog problems before UV light causes them to decompose, but we really need BC to sort us out on that one.
The CO2 reduction might be quite significant (a few percent?) but it's not going to solve the real problem. Now, if we could figure out a way to recover the waste heat, that might be a different story.
Personally, I'm betting on mortadella fusion.
Quote from: Geezer on 16/05/2011 17:23:16Personally, I'm betting on mortadella fusion.What is this? Google comes up with Italian sausage! 
European Union (EU) testing rates the 999 cc Smart at 4.7 L/100 km (60 mpg-imp; 50 mpg-US) for the gasoline model and 3.4 L/100 km (83 mpg-imp; 69 mpg-US) for the diesel. The U.S. Environmental Protection Agency (EPA) rates the vehicle at 36 mpg-US (6.5 L/100 km; 43 mpg-imp) combined.