UK car sales see first drop for six years
frustration and consternation within the motor industry.
The industry needs to sell diesels, because they are generally more fuel efficient than petrol cars and therefore produce less carbon dioxide.
That helps car companies to meet targets for reducing CO2, introduced in order to combat climate change.
But concern about the level of nitrogen oxides (NOX) they produce has made them a favorite target for clean air campaigners.
The industry talks about a short-sighted backlash against new technology, which is encouraging people to stick with older, dirtier cars — and preventing