Ugh not getting it. The problem isn't the new ones being better, its that until every last one of the old ones is melted down, it'll be a PR nightmare trying t

Ugh not getting it. The problem isn't the new ones being better, its that until every last one of the old ones is melted down, it'll be a PR nightmare trying to sell new diesels to people who were just choked in a school bus smoke cloud yesterday or choked in a semi truck cloud this morning. It doesn't mean anything to those customers that the new diesels aren't like that, or the cloud generator was a 1990 model. All that matters is they can almost still smell that stinking cloud. One effective although expensive way to sell diesels in 2015 would be to buy every pre-2005 or so diesel and melt it down into scrap metal. We can't afford that, although over a very long period of time it'll eventually take place naturally. Another way would be to enforce emissions limits and emissions testing such that nobody ever sees a 1995 diesel truck laying down a smoke cloud. We've pretty much chosen not to do that, as a society.