Me too! The more current diesels from the smallest pickup truck > city 
buses > heavy over the road trucks and even 4000 hp. railroad 
locomotives use electronic fuel injection with significant improvements 
in fuel economy (mileage)  and pollution.  The fuel per ton-mile  of a 
modern locomotveis next to amazing. The days of smoky diesels are gone, 
just look at the exhausts (mainly realtively  harmless particlates) and 
the non-visibles are down also. And then there is soy diesel fuel!

I don't hear anything about the added water vapor and Co2 from high 
flying airplanes. 9/11 showed a significant change in cloud cover when 
skies were void of man made structures. When's the last time you saw a 
really clear starlight night??

Or natural occurance like vocanic eruptions and forest fires.

James Newton, Host wrote:
>> Not currently in the US, it isn't.  Automotive diesels in the 
>> US are dirty, and heavy/industrial diesels are unbelievably 
>> dirty.  So dirty that you can't put enough people on a bus or 
>> a commuter train to make them pollution competitive to all of 
>> those people driving a single passenger Suburban.
>>     
>
> I would very much like to see any study or figures that backs up that
> statement.
>
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