This article is as much a polemic as an analysis. As a simple example of its flaws, it suggests that gas engines should have gone the route of direct injection

This article is as much a polemic as an analysis. As a simple example of its flaws, it suggests that gas engines should have gone the route of direct injection to meet diesel efficiency. Guess what the effect of GDI is - much higher NOx emissions. It also pays short shrift to SCR, which when implemented properly can virtually eliminate oxides of nitrogen in emissions. Lots of mention of soot and particulates, no mention of the standard particulate filters required on all vehicles now. I think the commenters who are proclaiming the death of diesel are at risk of simply confirming their own pre-existing preferences for another technology, not so much doing objective analysis of the landscape. Having said the above, I would agree that the regulatory environment in Europe has failed to ensure that "clean diesel" is not an oxymoron.