Ok, I'll just say it. I am a huge fan of regulation of diesel. One only has to look at the amazing new diesel technology developments coming from companies like Caterpillar, Audi, VW, Subaru, Honda, and Mercedes to realize that regulation is the environment and consumers' friend.
Although there are serious economic impact considerations and the wording of regulation should not be taken lightly, California's new On-Road Heavy-Duty Diesel Vehicles (In-Use) Regulation is a HUGE step in the right direction. This needs support:
The Air Resources Board (ARB) staff is developing a regulation to reduce diesel particulate matter (PM) and other emissions from in-use heavy-duty diesel powered vehicles operating in California. A proposed regulation is planned to be presented to the Air Resources Board in December 2008. The proposed regulation would apply to diesel shuttle buses, vehicles greater than 14,000 pounds Gross Vehicle Weight Rating (GVWR), and does not include pickups.
If you disagree, then I would suggest you explain why/how to improve the regulation. Lack of regulation is a mistake and fear of poor regulation is a weak/lazy excuse.