Mark Gajewski wrote:
>
> I've always wondered about this...has anyone actually studied the
> energy used/pollution created in the manufacture of new vehicles.  At
> one point I had heard that in fact over the long run it is more
> beneficial to remove older "gross poluters" from the road due to the
> massive amounts of HC's, CO, NO2 etc. emitted by older vehicles as
> compared to brand new vehicles.

That is the argument used by the automobile manufacturers.
But would you not use that argument if you were trying to sell new
vehiles?
Its interesting when you think that automobile manufacturers were part
of the big push to eliminate the electric trams which preceded buses in
most big cities.