Commercial only? Sounds like they are focusing more on N0x reduction, which is good considering commercial vehicles are responsible for the majority of pollution, and usually noise levels. Never really considered noise levels to be important in a commercial vehicle. Only a 10% reduction in C02 equates to a 10% increase in fuel economy, but some of the newer vans are already very efficient. Check out this guy, he's averaged almost 50 UK MPG over 18,000 miles, with a best of almost 60 UK MPG, not bad for a commercial van!
In the US. The emissions laws are geared more for reducing nox and allows for more co2 & co. In Europe, it is mostly the other way around. Since diesel commonly produce more nox and less co2 & co then there gas counterparts it makes it harder in the US the meet the emmissions standards. But in Europe, it is easier for diesel.
As for taking emissions seriously, that is debatable as the "science" differs on which one is more important depending on who is paying for the research.
Since we know that co is poisonous to us and other animals. The nox takes more time and quantity to have an ill effect. I would say diesel is better for the environment then gas. Because of this i think Europe wins.
Yes I was referring to C02, as the US is the second biggest polluter on the planet, even trumping Russia 3 times over, with shocking water pollution levels and many endangered species too. Even the N0X emissions are off the scale. But hey if you makes you feel better to deflect blame to a tiny city in a tiny country in England, then go ahead lol.
Hey, we're working on it. We're putting up wind farms hither and yon to kill as many raptors and migrators as possible, oh, and yeah, it'll produce a speck of power that won't amount to anything in the grand scheme of things but it will allow the likes of Gore, Obama etc. to make all sorts of wild claims and siphon off all sorts of funds.