If liberal judges or EPA mandates it, will semi-truck owners / diesel auto owners be punished as well? What about the costs that will have to be passed on to businesses and consumers who depend upon trains and semi-trucks for delivery of consumer goods? How many more jobs will disappear? How about the trains that haul coal to our electric companies - how much will our electric rates accelerate? The enviro-whackos (greenies), are part and parcel of the Obama administration; an administration completely off the rails.
It's already happened. The California Air Resources Board (CARB) mandates Diesel Particulate Filters (DPF's) on semi's operating in the state.