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Hybrid's stop the engine when not in use.  This is a technology
that could be added to all new engine's in the future.  This would
be VERY helpful during commuting in stop and go traffic.  Cars,
trucks and buses as well as stationary, agriculture, off road
engines all pollute when running.  Idle is the worst pollution
since no work is done.

Turbo engines produce more power with less fuel, less fuel means
less CO2 production.  Diesel turbo engines are the most fuel
efficient, therefore they naturally produce less CO2 then gasoline
engines.  Less use of fuel is the goal, or it should be.

Micro diesel hybrides could reduce our fuel use by more than 40%. 
We should be encouraging, not discouraging clean diesel.

And keep the engines OFF when they are not doing useful work, no
matter where or what that engine is working at.