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I fail to see the reasoning for removing diesel LDV from the
discussions of low carbon and low emissions. The total life cycle
of the fuel and vehicle have to be considered when determining
whether a energy source is higher or lower carbon or emissions
emitter.  While diesel is not as glamorous as hydrogen or hybrids,
it has proven itself highly adaptable to our changing vehicle
needs. It is here now, established, with infrastructure in place
that allows us take advantage of the benifits now.  And as
alternative diesel fuels and engine controls improve this venerable
design will carry us for many more years. Maybe by then hydrogen
and/or electric infrastructure will have caught up and be viable to
the vast majority of car owners.  Until then I will continue to
save money and resources driving a diesel automobile.