a diesel is a cleaner burning engine than the gassers main reason for the horrible emissions is due to the sulfur in the current fuel and thus CATS that would lower those ouputs are not used.

Gassers have extensive emission controls that diesels don't. Once low sulfur or biofuels are being widely used NOx cats + PM traps can be used and get a diesel's output well below gassers standards.

just keep in mind heavy PM output (diesel) is less harmfull than lighter PM output(gasser) Iam reffering to weight and size of the particles.

current USA EPA standards favor the gassers emission outputs thus HCs and COs aren't regulated as heavy as NOx and PM IMO.

I would like to see in a yr or two a hybrid diesel setup and run off Biodiesel would rock.

I think Fuel Cell is a dead expensive issue that will never happen and diesel hybrids will be the new green machine with power to spare.

Its amazing to me to watch a city bus take off from a stop light and emit no smoke. OKC recently switched to biodiesel for its city busses. Diesel can be clean just more steps need to be taken.